समीकरण \(x^2+10x+21=0\) के मूल कौन से हैं?
What are the roots of \(x^2+10x+21=0\)?
Explanation opens after your attempt
A. (-3) और (-7)(-3) and (-7)
Concept
(x-2+10x+21=(x+3)(x+7)). Therefore the roots are (-3) and (-7).
Why this answer is correct
The correct answer is A. (-3) और (-7) / (-3) and (-7). (x-2+10x+21=(x+3)(x+7)). Therefore the roots are (-3) and (-7).
Exam Tip
(x-2+10x+21=(x+3)(x+7)) है। इसलिए मूल (-3) और (-7) हैं।
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