((x-9)2) का सही विस्तार क्या है?
What is the correct expansion of ((x-9)2)?
Explanation opens after your attempt
A. \(x^2-18x+81\)
Concept
((a-b)2=a-2-2ab+b-2). Therefore the middle term is (-18x).
Why this answer is correct
The correct answer is A. \(x^2-18x+81\). ((a-b)2=a-2-2ab+b-2). Therefore the middle term is (-18x).
Exam Tip
((a-b)2=a-2-2ab+b-2) होता है। इसलिए मध्य पद (-18x) है।
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