यदि (f(x)=x-2+ax) और (g(x)=bx+1) हों तथा ((f-g)(x)=x-2-5x-1), तो ((a,b)) क्या है?
If (f(x)=x-2+ax) and (g(x)=bx+1), and ((f-g)(x)=x-2-5x-1), what is ((a,b))?
Explanation opens after your attempt
A. ((a,b)=(2,7))
Concept
((f-g)(x)=x-2+(a-b)x-1), so (a-b=-5). Among the options, only ((2,7)) works.
Why this answer is correct
The correct answer is A. ((a,b)=(2,7)). ((f-g)(x)=x-2+(a-b)x-1), so (a-b=-5). Among the options, only ((2,7)) works.
Exam Tip
((f-g)(x)=x-2+(a-b)x-1), इसलिए (a-b=-5)। दिए विकल्पों में केवल ((2,7)) सही है।
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