Question

COMO RESOLVO ESSA EQUACAO IRRACIONAL
∛(X+9)(X-9)=-1

Answer 1

$\sqrt[3]{(x+9)(x-9)} =-1\\ (\sqrt[3]{(x+9)(x-9)})^3 =-1^3\\(x+9)(x-9) =-1\\x^2-81=-1\\x^2=80\\x=\sqrt{80}$