Question

Determine o valor da expressão algébrica:

x³ - 2x²+ 3x, quando x= - 1/2
( fração)

Por Favor !!!

Answer 1

$- { \frac{1}{2} }^{3} - 2 \times ( \: - { \frac { 1}{2} }^{2}) + 3 \times ( - \frac{1}{2} ) \\ \\ - \frac{1}{8} - 2 \times ( \frac{1}{4} ) - \frac{3}{2} \\ \\ - \frac{1}{8} - \frac{2}{4} - \frac{3}{2} \\ \\ - \frac{1}{8} - \frac{4}{8} - \frac{12}{8} = - \frac{17}{8}$

Answer 2

x³ - 2x²+ 3x, quando x= - 1/2

$\frac{(-1) ^{3} }{2 ^{3} }-2* \frac{-1 ^{2} }{2 ^{2} } +3* \frac{-1}{2} \\ \frac{-1}{8} -2* \frac{1}{4} - \frac{3}{2} \\ \frac{-1}{8} - \frac{2}{4} - \frac{3}{2} \\ MMC(8,4,2) = 8 \\ \frac{-1-4-12}{8} \\ -\frac{17}{8}$