यदि (f(x)=|x|+x) और (g(x)=|x|-x) हों, तो ((fg)(x)) का मान क्या होगा?
If (f(x)=|x|+x) and (g(x)=|x|-x), what is ((fg)(x))?
Explanation opens after your attempt
A. (0)
Concept
((|x|+x)(|x|-x)=|x|2-x-2=0). The identity ((a+b)(a-b)=a-2-b-2) is useful.
Why this answer is correct
The correct answer is A. (0). ((|x|+x)(|x|-x)=|x|2-x-2=0). The identity ((a+b)(a-b)=a-2-b-2) is useful.
Exam Tip
((|x|+x)(|x|-x)=|x|2-x-2=0)। पहचान ((a+b)(a-b)=a-2-b-2) उपयोगी रहती है।
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