Question

Cum se rezolva aceasta ecuatie : radical de ordinu trei din x-1= -2 ?

Answer 1

$\sqrt[3]{x-1}=-2 \Big|^3 \Rightarrow (\sqrt[3]{x-1})^3 = (-2)^3\Rightarrow x-1 = -8 \Rightarrow \boxed{x = -7}$

Answer 2

∛(x-1) = -2

[∛(x-1)]³ = (-2)³

x-1 = -8

x = -8 + 1

x = -7