Question

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

Answer 1

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