Question

a, x⁴ = 16

Answer 1

\(\Leftrightarrow x\in\left\{2;-2\right\}\)

Answer 2

\(x^4=16\)

\(\Leftrightarrow x^4=\left(\pm2\right)^4\)

\(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)

Answer 3

\(x^4=16\)

\(\Leftrightarrow\left|x\right|=2\)

\(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)

Answer 4

a) \(x^4=16\)

\(\Rightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)

Vậy: \(x\in\left\{2;-2\right\}\)

Answer 5

X⁴=16

X=2