Question

x/2=18/x

Answer 1

\(\dfrac{x}{2}=\dfrac{18}{x}\)

\(\Leftrightarrow x^2=18\cdot2=36\)

\(\Leftrightarrow x=\pm\sqrt{36}=\pm6\)

Answer 2

\(\dfrac{x}{2}=\dfrac{18}{x}\)

\(=>x^2=18\cdot2\)

\(x^2=36\)

\(x^2=\left(\pm6\right)^2\)

\(x=\pm6\)

Vậy x=.....