Question

Dado o polinômio P(x)=x^3 - 5x^2+x-1 calcule P(1/2)

Answer 1

P(x)= x³ -5x² + x -1
P(x)=$( \frac{1}{2}) ^{3} -5 ( \frac{1}{2}) ^{2} + \frac{1}{2}-1$
P(x)=$\frac{1}{8} -5 \frac{1}{4} + \frac{1}{2} -1 =$
P(x)=$\frac{1}{8} - \frac{5}{4} + \frac{1}{2} -1=$
P(x)=$\frac{2-20+8-16}{16} = \frac{-26}{16}= \frac{-13}{8}$