Question

Tìm x: x + 2phần-4 = -9phầnx + 2

Các bạn giúp mik vs ạ

Answer 1

\(\dfrac{x+2}{-4}=-\dfrac{9}{x+2}\\ \Rightarrow\left(x+2\right)^2=\left(-4\right).\left(-9\right)\\ \Rightarrow\left(x+2\right)^2=36\\ \Rightarrow\left(x+2\right)^2=\pm6^2\\ \Rightarrow\left[{}\begin{matrix}x+2=6\\x+2=-6\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=4\\x=-8\end{matrix}\right.\)

Answer 2

=>(x+2)^2=36

=>x+2=6 hoặc x+2=-6

=>x=4 hoặc x=-8