Question

1) (a - b)² - c², quando A = ⅔ , b = 1 e C = -1​

Answer 1

Resposta:

${( \frac{2}{3} - 1)}^{2} - {( - 1)}^{2} \\ \\ ( { - \frac{1}{3}) }^{2} - 1 \\ \\ \frac{1}{9} - 1 \\ \\ \frac{1 - 9}{9} \\ \\ \frac{ - 8}{9} \\ \\ = - \frac{8}{9}$