Question

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$x.(x + 2) = 4x$

Answer 1

$Bom \: \: dia!!! \\ \\ x(x + 2) = 4x \\ x \times (x + 2) - 4x = 0 \\ ( \times + 2 - 4)x = 0 \\ (x - 2)x = 0 \\ \\ x - 2 = 0 --- x = 2 \\ x = 0 \\ \\ {x}^{1} = 0 \\ {x}^{2} = 2 \\ \\ Espero \: \: ter \: \: ajudado! :)$

Answer 2

Solução:
$x .(x + 2) = 4x$
$x^{2} +2x = 4x$
$x^{2} +2x-4x=0$
$x^{2} -2x=0$

$X= \frac{-(-2)+- \sqrt{(-2)^{2}-4.1.0 } }{2.1}$

$X = \frac{2+- \sqrt{(-2)^{2}-0 } }{2}$

$X = \frac{2+- \sqrt{(-2)^{2} } }{2}$

$X = \frac{2+-2}{2}$

$X= \frac{2 + 2}{2}$

$X = \frac{2-2}{2}$

$X_{1} = 0$
$X_{2} = 2$