\(b^2-b-20\) के गुणनखंड कौन से हैं?
What are the factors of \(b^2-b-20\)?
Explanation opens after your attempt
A. ((b-5)(b+4))
Concept
(-5+4=-1) and \(-5\times4=-20\). Exam tip: choose opposite signs for a negative product.
Why this answer is correct
The correct answer is A. ((b-5)(b+4)). (-5+4=-1) and \(-5\times4=-20\). Exam tip: choose opposite signs for a negative product.
Exam Tip
(-5+4=-1) और \(-5\times4=-20\) है। परीक्षा में ऋणात्मक गुणनफल के लिए विपरीत चिन्ह चुनें।
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