Question

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f(x) = x² - 8x+8

Answer 1

$\Large\mathsf\displaystyle{}f\left(x\right) = {x}^{2} - 8x + 8 \\ \Large\mathsf\displaystyle{}\begin{cases}a = 1 \\ b = - 8\end{cases} \\\\\ \Large\mathsf\displaystyle{}x = \dfrac{ - 8}{2 \cdot1} \\\\ \\ \Large\mathsf\displaystyle{}x = - \dfrac{ - 8}{2} \\\\\\ \Large\mathsf\displaystyle{}x = - \left( - 4\right) \\\\\\ \Large\mathsf\displaystyle{}x = 4 \\\\ \Large\mathsf\displaystyle{}f\left(4\right) = {4}^{2} - 8\cdot4 + 8 \\ \Large\mathsf\displaystyle{}f\left(4\right) = 16 - 8\cdot4 + 8 \\ \Large\mathsf\displaystyle{}f\left(4\right) = 16 - 32 + 8 \\ \Large\mathsf\displaystyle{}f\left(4\right) = - 8$

$\displaystyle\text{ \begin{gathered} \underline{\boxed{\boldsymbol{ S = 4, - 8 }}}\end{gathered} }$

$\displaystyle\text{ \begin{gathered} \underline{\boxed{\boldsymbol{{ \red{Bons}} \blue{\:Estudos}}}}\end{gathered} }$