यदि \(f(x)=x^2+1\) और \(g(x)=x-1\), तो \((f\circ g)(3)\) कितना होगा?
If \(f(x)=x^2+1\) and \(g(x)=x-1\), what is \((f\circ g)(3)\)?
Explanation opens after your attempt
A. 5
Concept
For a composition evaluate the inner function first: \((f\circ g)(3)=f(g(3))\).
Why this answer is correct
\(g(3)=3-1=2\).
Exam Tip
\(f(2)=2^2+1=4+1=5\). Thus the correct value is 5. The option 4 is a common mistake if you forget the "+1" in \(f(x)\); other wrong choices arise from similar arithmetic slip-ups. Exam tip: always compute the inner function value first, then substitute into the outer function.
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