Question

1/4a² - 7a + 2/3 ab para a= -2 e b= 2?

Answer 1

Resposta:

$\frac{1}{4} {a}^{2} - 7a + \frac{2}{3} ab \: \: \: \: \: a = - 2 \: \: \: \: b = 2 \\ \frac{1}{4} \times ( { - 2})^{2} - 7 \times ( - 2) + \frac{2}{3} \times ( - 2) \times 2 \\ \frac{1}{4} \times 4 + 14 + \frac{2}{3} \times ( - 4) \\ \frac{4}{4} + 14 + ( - \frac{8}{3} ) \\ 1 + 14 - \frac{8}{3} \\ 15 - \frac{8}{3} = \frac{45 - 8}{3} = \frac{37}{3}$