Question
If $f(x)=x^2-1$. Find fof
✓
Answer
$f(x)=x^2-1$
$f \circ f(x)=f(f x))=f\left(x^2-1\right)$
$=\left(x^2-1\right)^2-1 ;$
$=x^4-2 x^2+1-1$
$=x^4-2 x^2$
$f \circ f(x)=f(f x))=f\left(x^2-1\right)$
$=\left(x^2-1\right)^2-1 ;$
$=x^4-2 x^2+1-1$
$=x^4-2 x^2$
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