Question

Giải giúp mik bài vs gấp lắm ạ:<

Answer 1

\(\left(-2+x^2\right)\left(-2+x^2\right)\left(-2+x^2\right)\left(-2+x^2\right)\left(-2+x^2\right)=1\)

\(\Leftrightarrow\left(-2+x^2\right)^5=1\)

\(\Leftrightarrow-2+x^2=1\)

\(\Leftrightarrow x^2=3\Leftrightarrow x=\pm\sqrt{3}\)