Question

tìm x 

-9 + x mũ 2 = -2 

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Answer 1

`-9+x^2=-2`

`x^2=-2-(-9)`

`x^2=-2+9`

`x^2=7`

`=>`\(x=+\sqrt{7};-\sqrt{7}\)

Answer 2

\(x^2=-2-\left(-9\right)\\ x^2=7\\ \left[{}\begin{matrix}x=\sqrt{7}\\x=-\sqrt{7}\end{matrix}\right.\)

Answer 3

-9 + x² = -2

x² = (-2) -( -9)

x²= -11

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