[tex]\implies {\blue {\boxed {\boxed {\purple {\sf {f(-3)\:=\:3}}}}}}[/tex]
[tex]\sf \bf {\boxed {\mathbb {STEP-BY-STEP\:\:EXPLANATION:}}}[/tex]
[tex]f(x) = {x}^{2} + 2x[/tex]
For [tex]f( - 3)[/tex], substitute "[tex]-3[/tex]" for each occurrence of "[tex]x[/tex]".
[tex]f( - 3) = ( { - 3})^{2} + 2( - 3)[/tex]
[tex] = ( - 3 \times - 3) - 6[/tex]
[tex] = 9 - 6[/tex]
[tex] = 3[/tex]
[tex]\red{\large\qquad \qquad \underline{ \pmb{{ \mathbb{ \maltese \: \: Mystique35♛}}}}}[/tex]
