Question

[Hoài Thu Vũ]

tìm x biết 4x³+x=4x²

Answer 1

[Thầy Cao Đô]

$4x^3 + x = 4x^2$

$\Leftrightarrow x(4x^2 - 4x + 1) = 0$

$\Leftrightarrow x(2x - 1)^2 = 0$

$\Leftrightarrow \left[\begin{aligned}&x = 0\\ &2x - 1 = 0\\ \end{aligned}\right. \Leftrightarrow \left[\begin{aligned}&x = 0\\ &x = \dfrac12\\ \end{aligned}\right.$