\(x^2-4x-21\) को गुणनखंडों में लिखिए।
Write \(x^2-4x-21\) in factors.
Explanation opens after your attempt
A. ((x-7)(x+3))
Concept
(-7+3=-4) and ((-7)(3)=-21). In exams, keep the larger factor's sign like the middle term.
Why this answer is correct
The correct answer is A. ((x-7)(x+3)). (-7+3=-4) and ((-7)(3)=-21). In exams, keep the larger factor's sign like the middle term.
Exam Tip
(-7+3=-4) और ((-7)(3)=-21) है। परीक्षा में बड़े गुणनखंड का चिह्न मध्य पद जैसा रखें।
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