( (2x+5)2-(2x-5)2 ) का मान क्या है?
What is the value of ( (2x+5)2-(2x-5)2 )?
Explanation opens after your attempt
B. (40x)
Concept
This is ( (a+b)2-(a-b)2=4ab ) where (a=2x) and (b=5). Exam tip: use the (4ab) identity quickly.
Why this answer is correct
The correct answer is B. (40x). This is ( (a+b)2-(a-b)2=4ab ) where (a=2x) and (b=5). Exam tip: use the (4ab) identity quickly.
Exam Tip
यह ( (a+b)2-(a-b)2=4ab ) है जहाँ (a=2x) और (b=5)। परीक्षा में (4ab) पहचान जल्दी लगाएँ।
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