Question

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Dado o polinômio P(x)=2x³-5x²+x-3.Calcule:
A)P(-1/2)

Answer 1

Olá,

Para encontrar P(-1/2) basta colocar -1/2 no lugar do x e desenvolver:

$P(x)=2x^3-5x^2+x-3$

$P( \frac{-1}{2} )=2( \frac{-1}{2}) ^3-5 (\frac{-1}{2}) ^2+ \frac{-1}{2} -3$

$P( \frac{-1}{2} )= \frac{1}{4} - \frac{5}{4}-\frac{1}{2} -3= \frac{1-5-2-12}{4} = \frac{-20}{4}=\boxed{-5}$