Question

5. Calcula el valor numérico del polinomio:
${x}^{3} - \frac{1}{2} x$
a. x= 4

b. x= -2​

Answer 1

$a) {x}^{3} - \frac{1}{2} x = \\ {4}^{3} - \frac{1}{2} \times 4 = \\ 64 - 2 = \\ 62$

$b) {x}^{3} - \frac{1}{2} x = \\ {( - 2)}^{3} - \frac{1}{2} \times ( - 2) = \\ - 8 - ( - 1) = \\ - 8 + 1 = \\ - 7$