Question

como resolver?
$2 {x}^{2} - 4x = 0$
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Answer 1

$2 {x}^{2} - 4x = 0 \\ 2x(x - 2) = 0 \\ 2x = 0 \\ x = \frac{0}{2} = 0$

$x - 2 = 0 \\ x = 2$

Answer 2

2x² - 4x = 0 ===> :(2)

x² - 2x = 0

x(x-2)=0 ===> x=0 ✓

(x-2)=0 ====> x=2 ✓ ==> S: {0, 2}