Question

F(x) = x2 + 2x find f(-3)

Answer 1

$\longrightarrow{\blue{f(-3)\:=\:3}}$ 

$\large\mathfrak{{\pmb{\underline{\red{Step-by-step\:explanation}}{\red{:}}}}}$

$f(x) = {x}^{2} + 2x$

For $f( - 3)$, substitute "$-3$" for each occurrence of "$x$".

$f( - 3) = ( { - 3})^{2} + 2( - 3)$

$= ( - 3 \times - 3) - 6$

$= 9 - 6$

$= 3$

$\large\mathfrak{{\pmb{\underline{\orange{Mystique35 }}{\orange{❦}}}}}$