Question

x phần -4=-9 phan x

Answer 1

\(\frac{x}{-4}=\frac{9}{x}\)

x.x=(-4).9

x.x=-36

\(x^2=-36\)

x= -6

Answer 2

\(\frac{x}{-4}=-\frac{9}{x}\Rightarrow\frac{x.x}{-4x}=\frac{-9.-4}{-4x}\Rightarrow x^2=36=\left(6\right)^2=\left(-6\right)^2\)

=> x = 6 hoặc x= -6 

Answer 3

\(\frac{x}{-4}=-\frac{9}{x}\Rightarrow x^2=36\Rightarrow x=+-6\)