Question

f(x)=1/2*(x-1)*2; x0=3

Answer 1

$f(x)=frac {1}{2}cdot(x-1)cdot 2, quad x_0=3\\f(3)=frac {1}{2}cdot(3-1)cdot 2 \\f(3)=frac {1}{2}cdot 2cdot 2 =2$