\(x^2+4x-45\) का सही गुणनखंड कौन-सा है?
Which is the correct factorisation of \(x^2+4x-45\)?
Explanation opens after your attempt
A. ((x+9)(x-5))
Concept
(9-5=4) and (9\cdot(-5)=-45). In exams, keep the larger number's sign like the middle term.
Why this answer is correct
The correct answer is A. ((x+9)(x-5)). (9-5=4) and (9\cdot(-5)=-45). In exams, keep the larger number's sign like the middle term.
Exam Tip
(9-5=4) और (9\cdot(-5)=-45) है। परीक्षा में बड़ी संख्या का चिह्न मध्य पद जैसा रखें।
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