Question

Tìm x biết:

x⁷= x²

Answer 1

\(x^7=x^2\Rightarrow x^7-x^2=0\)

\(\Rightarrow x^2\left(x^5-1\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x^2=0\\x^5=1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=1\end{matrix}\right.\)

Answer 2

x⁷ = x²

<=> x⁷ - x² = 0

<=> x²(x⁵ - 1) = 0

<=> x² = 0 hoặc x⁵ - 1 = 0

<=> x = 0 hoặc x = 1

Answer 3

`<=> x^7 - x^2 = 0`

`<=> x^2(x^5-1) = 0`

`<=> x = 0` hoặc `x = 1`