Question

x/-8=-18/x

 

Answer 1

\(\frac{x}{-8}=\frac{-18}{x}\)

\(\Rightarrow x^2=\left(-8\right).\left(-18\right)\)

\(\Rightarrow x^2=144\)

\(\Rightarrow x=\pm12\)

Vậy \(x=\pm12\)

Answer 2

\(\frac{x}{-8}=\frac{-18}{x}\)

=> x² = -18 . (-8)

=> x² = 144

=> x = \(\sqrt{144}\) = 12

hoặc x = \(-\sqrt{144}\) = -12

Vậy x = 12 hoặc x = -12

Answer 3

\(\frac{x}{-8}\)\(=\frac{-18}{x}\)

\(=>x.x=\left(-8\right).\left(-18\right)\)

\(=>x^2\)\(=144\)

Mà, ta lại có:

\(12^2\)\(=144;\left(-12\right)^2\)\(=144\)

\(=>x=12\) hay\(x=-12\)