Question

If $f\left(x\right)=x^3-3x^2+5$

Find f(0)+f(3).

Answer 1

$\begin{array}{c}Wehave\\ f\left(x\right)=x^3-3x^2+5\\ Now,ifx=0\\ f\left(0\right)={\left(0\right)}^3-3{\left(0\right)}^2+5\\ =5\\ and,ifx=3\\ f\left(3\right)={\left(3\right)}^2-3{\left(3\right)}^2+5\\ =27-3\times 9+5\\ =27-27+5\\ =5\\ Now,\\ f\left(0\right)+f\left(3\right)\\ =5+5\\ =10.\\ whichistherequiredanswer.\end{array}$