Question

f (x) = x³ -2x+1,x= -1

 f (x )= f ( x) = x²-9,x=  3 

Answer 1

$f(x)=x^3-2x+1\\\\\boxed{x=-1}$

se x = -1 ...então é só substituir x por -1 na função
$f(-1) = (-1)^3-2*(-1)+1\\\\f(-1)=-1+2+1\\\\f(-1)=2$
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$f(x)=x^2-9\\\\\boxed{x=3}$

substituindo x por 3
$f(3) = 3^2-9\\\\f(3) = 9-9\\\\f(3)=0$