\(20x^2-43x+21=0\) में मध्य पद का सही विभाजन कौनसा है?
What is the correct splitting of the middle term in \(20x^2-43x+21=0\)?
Explanation opens after your attempt
Correct Answer
A. \(20x^2-28x-15x+21=0\)
Concept
Here (ac=420) and (-28+(-15)=-43), so the correct split is (-28x-15x). In exams, even when (ac) is large, match both sum and product.
Why this answer is correct
The correct answer is A. \(20x^2-28x-15x+21=0\). Here (ac=420) and (-28+(-15)=-43), so the correct split is (-28x-15x). In exams, even when (ac) is large, match both sum and product.
Exam Tip
यहां (ac=420) और (-28+(-15)=-43), इसलिए सही विभाजन (-28x-15x) है। परीक्षा में (ac) बड़ा हो तो भी योग और गुणनफल दोनों मिलाएं।
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