# For the function f(x) = x^2 - 2x + 1, how do you find f(0)?

$f \left(0\right) = 1$
$\textcolor{w h i t e}{\text{XXX}} f \left(\textcolor{red}{x}\right) = {\textcolor{red}{x}}^{2} - 2 \textcolor{red}{x} + 1$
To find $f \left(\textcolor{b l u e}{0}\right)$ replace $\textcolor{red}{x}$ with $\textcolor{b l u e}{0}$
$\textcolor{w h i t e}{\text{XXX}} f \left(\textcolor{b l u e}{0}\right) = {\textcolor{b l u e}{0}}^{2} - 2 \left(\textcolor{b l u e}{0}\right) + 1 = \textcolor{g r e e n}{1}$