Question

3) Considere o polinômio P(x) = x3 + 2x2 – 5x - 3. O valor da expressão 12. P(1) é:​

Answer 1

✅ Após resolver os cálculos, concluímos que o valor numérico do referido polinômio para x = 1 é:

                $\Large\displaystyle\text{ \begin{gathered}\boxed{\boxed{\:\:\:\bf P(1) = -5\:\:\:}}\end{gathered} }$

Seja o polinômio:

        $\Large\displaystyle\begin{gathered} P(x) = x^{3} + 2x^{2} - 5x - 3\end{gathered}$

Se estamos procurando o valor de "P(1)", então:

            $\Large\displaystyle\begin{gathered} P(1)= \:?\Longrightarrow x = 1\end{gathered}$

Portanto, temos:

        $\Large\displaystyle\begin{gathered} P(1) = 1^{3} + 2\cdot1^{2} - 5\cdot1 - 3\end{gathered}$

                    $\Large\displaystyle\begin{gathered} = 1 + 2 - 5 - 3\end{gathered}$

                    $\Large\displaystyle\begin{gathered} = -5\end{gathered}$

✅ Portanto, o valor é:

         $\Large\displaystyle\begin{gathered} P(1) = -5\end{gathered}$

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