Question

Find $f(4)$ if $f(x)=x^2-4x+3$

Answer 1

$f(x)=x^2-4x+3$

We have to find f(4)

substituting 4 in the place of x in the above equation we get

$f(4)=4^2-4\cdot 4+3=16-16+3=3$