( (5x+1)2-(5x-1)2 ) का मान क्या है?
What is the value of ( (5x+1)2-(5x-1)2 )?
Explanation opens after your attempt
B. (20x)
Concept
( (u+v)2-(u-v)2=4uv ). Here (u=5x) and (v=1), so it is (20x).
Why this answer is correct
The correct answer is B. (20x). ( (u+v)2-(u-v)2=4uv ). Here (u=5x) and (v=1), so it is (20x).
Exam Tip
( (u+v)2-(u-v)2=4uv ) है। यहाँ (u=5x) और (v=1) इसलिए (20x) है।
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