[tex]{\huge \boxed{ \pink {\bf{M}}} \boxed {\bf{a}}}{\huge\boxed { {\bf{t}}}\boxed { \blue {\bf{h}}}} [/tex]
[tex]\Large\begin{gathered} \begin{gathered}\large \overline{ \boxed{\boxed{ \begin{array}{r}\mathsf{ f\left(x\right) = {2x}^{2} - 6x - 4 }\end{array}}}} \end{gathered} \end{gathered}[/tex]
[tex]\Large\bm{} \mathsf{}f\left(3\right) = 2\cdot {3}^{2} - 6\cdot3 - 4 \\ \Large\bm{} \mathsf{}f\left(3\right) = 2\cdot9 - 6\cdot3 - 4 \\ \Large\bm{} \mathsf{}f\left(3\right) = \cancel{18}\cancel{ - 18} - 4 \\ \Large\bm{} \mathsf{}f\left(3\right) = 0- 4 \\\Large\bm{} \mathsf{}\boxed{f \left(3\right) = - 4}[/tex]
Observação
Com dois opostos somam 0, pode se remover da expressão.
Veja mais sobre o tema: Funções definida
[tex]\bm\Large\begin{gathered} \begin{gathered}\large \overline{ \boxed{\boxed{ \begin{array}{r}\mathsf{\red{Bons~Estudos} }\end{array}}}} \end{gathered} \end{gathered}[/tex]
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[tex]{\huge \boxed{ \pink {\bf{M}}} \boxed {\bf{a}}}{\huge\boxed { {\bf{t}}}\boxed { \blue {\bf{h}}}} [/tex]
[tex]\Large\begin{gathered} \begin{gathered}\large \overline{ \boxed{\boxed{ \begin{array}{r}\mathsf{ f\left(x\right) = {2x}^{2} - 6x - 4 }\end{array}}}} \end{gathered} \end{gathered}[/tex]
[tex]\Large\bm{} \mathsf{}f\left(3\right) = 2\cdot {3}^{2} - 6\cdot3 - 4 \\ \Large\bm{} \mathsf{}f\left(3\right) = 2\cdot9 - 6\cdot3 - 4 \\ \Large\bm{} \mathsf{}f\left(3\right) = \cancel{18}\cancel{ - 18} - 4 \\ \Large\bm{} \mathsf{}f\left(3\right) = 0- 4 \\\Large\bm{} \mathsf{}\boxed{f \left(3\right) = - 4}[/tex]
Observação
Com dois opostos somam 0, pode se remover da expressão.
Veja mais sobre o tema: Funções definida
[tex]\bm\Large\begin{gathered} \begin{gathered}\large \overline{ \boxed{\boxed{ \begin{array}{r}\mathsf{\red{Bons~Estudos} }\end{array}}}} \end{gathered} \end{gathered}[/tex]