यदि (f(x)=x-2), (g(x)=x+1) और (h(x)=x-1) हैं तो (f(g(x))-f(h(x))) क्या है?
If (f(x)=x-2), (g(x)=x+1) and (h(x)=x-1) then what is (f(g(x))-f(h(x)))?
Explanation opens after your attempt
Correct Answer
A. (4x)
Concept
(f(g(x))=(x+1)2) and (f(h(x))=(x-1)2), so the difference is (4x). The difference of squares formula is fast here.
Why this answer is correct
The correct answer is A. (4x). (f(g(x))=(x+1)2) and (f(h(x))=(x-1)2), so the difference is (4x). The difference of squares formula is fast here.
Exam Tip
(f(g(x))=(x+1)2) और (f(h(x))=(x-1)2), इसलिए अंतर (4x) है। वर्गों के अंतर का सूत्र तेजी देता है।
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