Question

Tìm x: \(x-2\sqrt{x}=0\)

Answer 1

\(x-2\sqrt{x}=0\)

<=> x² = \(\left(2\sqrt{x}\right)^2\)

<=> x² = 4x

<=> x² - 4x = 0

<=> x(x-4) = 0

<=> \(\left[\begin{array}{nghiempt}x=0\\x=4\end{array}\right.\)

Answer 2

\(x-2\sqrt{x}=0\)

\(\Rightarrow x=2\sqrt{x}\)

\(\Rightarrow x^2=4x\)

\(\Rightarrow x=4\)

Vậy x = 4