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x²+px+q আকারের রাশির উৎপাদক (৪.৫)

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আমরা জানি, x2+(a+b)x+ab=(x+a)(x+b) । এই সূত্রটির বামপাশের রাশির সাথে x2+px+qএর তুলনা করলে দেখা যায় যে, উভয় রাশিতেই তিনটি পদ আছে, প্রথম পদটি x2 ও এর সহগ 1 (এক), দ্বিতীয় বা মধ্য পদটিতে x আছে যার সহগ যথাক্রমে (a+b) ও q আছে। তৃতীয় পদটি x বর্জিত, যেখানে যথাক্রমে ab ও q আছে।

x2+(a+b)x+ab এর দুইটি উৎপাদক। অতএব, x2+px+q এরও দুইটি উৎপাদক হবে।

মনে করি, x2+px+q এর উৎপাদক দুইটি (x+a),(x+b)

সুতরাং, x2+px+q=(x+a) 

তাহলে, p=a+b এবং q=ab

এখন, x2+px+q এর উৎপাদক নির্ণয় করতে হলে, q কে এমন দুইটি উৎপাদকে প্রকাশ করতে হবে যার বীজগণিতীয় সমষ্টি p হয়। এই প্রক্রিয়াকে মধ্যপদ বিভাজন (Middle term breakup) বলে। x2+7x+12 রাশিটিকে উৎপাদকে বিশ্লেষণ করতে হলে 12 কে এমন দুইটি উৎপাদকে প্ৰকাশ করতে হবে যার সমষ্টি 7 এবং গুণফল 12 হয়। 12 এর সম্ভাব্য উৎপাদক জোড়াসমূহ 1,12, 2,6 ও 3,4 । এদের মধ্যে 3,4 জোড়াটির সমষ্টি (3+4)=7 এবং গুণফল 3 ×4=12

x2+7x+12=(x+3)(x+4)

মন্তব্য : প্রতিক্ষেত্রে p ও q উভয়ই ধনাত্মক বিবেচনা করে, x2+px+q, x2-px+q, x2+px-q এবং x2-pxq আকারের রাশির উৎপাদকে বিশ্লেষণ করতে হলে, প্রথম ও দ্বিতীয় রাশিতে q ধনাত্মক হওয়াতে q এর উৎপাদক দুইটি একই চিহ্নযুক্ত রাশি অর্থাৎ, উভয়ই ধনাত্মক অথবা উভয়ই ঋণাত্মক হবে। এক্ষেত্রে, p ধনাত্মক হলে, q এর উভয় উৎপাদকই ধনাত্মক হবে, আর p ঋণাত্মক হলে, q এর উভয় উৎপাদকই ঋণাত্মক হবে।

তৃতীয় ও চতুর্থ আকারের রাশিতে q ঋণাত্মক অর্থাৎ, -q হওয়াতে q এর উৎপাদক দুইটি বিপরীত চিহ্নযুক্ত হবে এবং p ধনাত্মক হলে, উৎপাদক দুইটির ধনাত্মক সংখ্যাটি ঋণাত্মক সংখ্যাটির পরম মান থেকে বড় হবে। আর p ঋণাত্মক হলে, উৎপাদক দুইটির ঋণাত্মক সংখ্যার পরম মান ধনাত্মক সংখ্যা থেকে বড় হবে।

 

উদাহরণ ৩। x2+5x+6 কে উৎপাদকে বিশ্লেষণ কর।

সমাধান : এমন দুইটি ধনাত্মক সংখ্যা নির্ণয় করতে হবে, যাদের সমষ্টি 5 এবং গুণফল 6। 6 এর সম্ভাব্য উৎপাদক জোড়াগুলো হচ্ছে 1,6 ও 2,3

এদের মধ্যে 2,3 জোড়াটির সংখ্যাগুলোর সমষ্টি 2+3=5 এর গুণফল 2x3=6

x2+5x+6= x2+2x+3x+6

                          =x(x+2)+3(x+2)

                          =(x+2)(x+3)

 

উদাহরণ ৪। x2-15x+54 কে উৎপাদকে বিশ্লেষণ কর।

সমাধান : এমন দুইটি সংখ্যা নির্ণয় করতে হবে যাদের সমষ্টি -15 এবং গুণফল 54 । এখানে দুইটি - সংখ্যার সমষ্টি ঋণাত্মক, কিন্তু গুণফল ধনাত্মক। কাজেই, সংখ্যা দুইটি উভয়ই ঋণাত্মক হবে। 54 এর সম্ভাব্য উৎপাদক জোড়াগুলো হচ্ছ 1,54,2,27,3,18, 6,9 । এদের মধ্যে 6,9 এর সংখ্যাগুলোর সমষ্টি =6-9=-15 এবং এদের গুণফল =(6)×(9)=54

x2-15x+54=x2-6x-9x+54

                          =x(x-6)-9(x6)

                          =(x-6)(x-9)

 

উদাহরণ ৫। x2+2x15 কে উৎপাদকে বিশ্লেষণ কর।

সমাধান : এমন দুইটি সংখ্যা নির্ণয় করতে হবে যাদের সমষ্টি 2 এবং গুণফল (-15) । এখানে দুইটি সংখ্যার সমষ্টি ধনাত্মক, কিন্তু গুণফল ঋণাত্মক। কাজেই, সংখ্যা দুইটির মধ্যে যে সংখ্যার পরম মান বড় সেই সংখ্যাটি ধনাত্মক, আর যে সংখ্যার পরম মান ছোট সে সংখ্যাটি ঋণাত্মক হবে। (-15) এর সম্ভাব্য উৎপাদক জোড়াগুলো হচ্ছে (1,15) ও (3,5)

এদের মধ্যে 3,5 এর সংখ্যাগুলোর সমষ্টি =3+5=2

x2+2x-15=x+5x3x15

                            =x(x+5)3(x+5)

                           =(x+5)(x3)

 

উদাহরণ ৬। x2-3x-28 কে উৎপাদকে বিশ্লেষণ কর।

সমাধান : এমন দুইটি সংখ্যা নির্ণয় করতে হবে যাদের সমষ্টি -3 এবং গুণফল (28) । এখানে দুইটি সংখ্যার সমষ্টি ঋণাত্মক এবং গুণফল ঋণাত্মক, কাজেই সংখ্যা দুইটির মধ্যে যে সংখ্যার পরম মান বড় সেই সংখ্যাটি ঋণাত্মক, আর যে সংখ্যাটির পরম মান ছোট সেই সংখ্যাটি ধনাত্মক হবে। (28) এর সম্ভাব্য উৎপাদক জোড়াগুলো হচ্ছে, 1,28;214 ও 47 । এদের মধ্যে 4,7 এর সংখ্যাগুলোর সমষ্টি =-7+4=-3

x2-3x-28=x2-7x+4x-28

                            =x(x7)+4(x-7)

                            =(x-7)(x+4)

কাজ : উৎপাদকে বিশ্লেষণ কর : 

 x2-18x+72          2 x2-9x-36           x2-23x+132

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Request history8.2.28PHP Version94.81msRequest Duration8MBMemory UsageGET academy/{slug}Route
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      app/Http/Controllers/Academy/SubjectController.php:102-110
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        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
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        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
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        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
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        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
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        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
      • QueryBuilder.php#305satt_satt_mobile_app340μsselect * from (select `questions`.`id`, `questions`.`subject_id`, `questions`.`category_id`, `questions`.`sub_category_id`, `questions`.`board_exam_id`, `questions`.`passage_id`, `questions`.`question_type`, `questions`.`question`, `questions`.`is_duplicate`, `questions`.`status`, `questions`.`image`, `subjectables`.`subject_id` as `pivot_subject_id`, `subjectables`.`subjectable_id` as `pivot_subjectable_id`, `subjectables`.`subjectable_type` as `pivot_subjectable_type`, row_number() over (partition by `subjectables`.`subject_id` order by `questions`.`created_at` desc) as `laravel_row` from `questions` inner join `subjectables` on `questions`.`id` = `subjectables`.`subjectable_id` where `subjectables`.`subject_id` in (14014) and `subjectables`.`subjectable_type` = 'App\\Models\\Question' and `questions`.`status` = 'active' and `questions`.`deleted_at` is null) as `laravel_table` where `laravel_row` <= 5 order by `laravel_row`
        Bindings
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        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
      • SubjectRepository.php#122satt_satt_mobile_app200μsselect * from `subjects` where `subjects`.`id` = 14014 and `subjects`.`deleted_at` is null limit 1
        Bindings
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        Backtrace
        • app/Repositories/SubjectRepository.php:122
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
        • app/Repositories/SubjectRepository.php:121
        • app/Services/SubjectService.php:60
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        Bindings
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        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
        • app/Repositories/SubjectRepository.php:121
        • app/Services/SubjectService.php:60
      • SubjectRepository.php#137satt_satt_mobile_app210μsselect * from `subjects` where `subjects`.`id` = 14014 and `subjects`.`deleted_at` is null limit 1
        Bindings
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        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
        • app/Repositories/SubjectRepository.php:136
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        Bindings
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        • app/Repositories/SubjectRepository.php:140
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
        • app/Repositories/SubjectRepository.php:136
        • app/Services/SubjectService.php:61
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        Backtrace
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        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
        • app/Repositories/SubjectRepository.php:136
        • app/Services/SubjectService.php:61
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        Bindings
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        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:38
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:60
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:235
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:227
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
      • QueryBuilder.php#305satt_satt_mobile_app450μsselect `id`, `name`, `parent_id`, `_lft`, `_rgt`, `name`, `slug`, `icon`, `banner` from `subjects` where (`subjects`.`_lft` between 39615 and 39812) and `subjects`.`deleted_at` is null
        Bindings
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        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:293
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
      • SubjectRepository.php#325satt_satt_mobile_app190μsselect * from `mediables` where `mediable_type` = 'App\\Models\\Subject' and `mediable_id` in (14014)
        Bindings
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        Backtrace
        • app/Repositories/SubjectRepository.php:325
        • app/Services/SubjectService.php:76
        • app/Http/Controllers/Academy/SubjectController.php:105
        • vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:44
      • SubjectRepository.php#340satt_satt_mobile_app180μsselect `videos`.`video_src_url`, `mediables`.`mediable_id` as `chapter_id` from `videos` inner join `mediables` on `mediables`.`mediable_id` = `videos`.`id` where `videos`.`id` = 0 and `videos`.`video_src` = 'youtube' and `videos`.`deleted_at` is null
        Bindings
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        Backtrace
        • app/Repositories/SubjectRepository.php:340
        • app/Services/SubjectService.php:77
        • app/Http/Controllers/Academy/SubjectController.php:105
        • vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:44
      • SubjectService.php#82satt_satt_mobile_app260μsselect `id`, `name`, `main_category_id`, `slug` from `subjects` where `id` <> 14014 and `parent_id` = 7875 and `main_category_id` = 2 and `subjects`.`deleted_at` is null limit 5
        Bindings
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        Backtrace
        • app/Services/SubjectService.php:82
        • app/Http/Controllers/Academy/SubjectController.php:105
        • vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:44
        • vendor/laravel/framework/src/Illuminate/Routing/Route.php:266
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        Bindings
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        Backtrace
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        • vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
        • vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
        • vendor/livewire/livewire/src/Mechanisms/ExtendBlade/ExtendedCompilerEngine.php:22
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      App\Models\Subject
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      App\Models\User
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