Question

Ajuda urgente!
-x2-5=-30

Answer 1

- x² - 5 = - 30

- x² = - 30 + 5

- x² = - 25 (1)

x² = 25

x = + - √25

x = + - 5

Resposta: S{ -5 e 5 }

Answer 2

$-x^2-5=-30\\ \\ -x^2=-30+5\\ \\ -x^2=-25\\ \\ x^2=25\\ \\ x=\pm\sqrt{25}\\ \\ \boxed{x=\pm5}$