((x+a)2) में (x) का गुणांक (14) है। (a) का मान क्या है?
In ((x+a)2), the coefficient of (x) is (14). What is the value of (a)?
Explanation opens after your attempt
B. (7)
Concept
((x+a)2=x-2+2ax+a-2), so (2a=14) and (a=7). Exam tip: treat the middle coefficient as (2a).
Why this answer is correct
The correct answer is B. (7). ((x+a)2=x-2+2ax+a-2), so (2a=14) and (a=7). Exam tip: treat the middle coefficient as (2a).
Exam Tip
((x+a)2=x-2+2ax+a-2) है इसलिए (2a=14) और (a=7)। परीक्षा में मध्य गुणांक को (2a) मानें।
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