Question

resolução: 3x²-8x=0 ?

Answer 1

$3x^2-8x=0\\\\-8x=0-3x^2\\\\-8x=-3x^2\\\\8x=3x^2\\\\8= \frac{3x^2}{x} \\\\8=3x\\\\ \frac{8}{3} =x$

ou vc poderia usar a formula de bhaskara
a = 3
b =-8
c=0
$\frac{-b\pm \sqrt{b^2-4*a*c} }{2*a}$

só substitui o valor das letras e fazer o calculo 

Answer 2

$x = \frac{-b \pm \sqrt{b^2 -4*a*c}}{2*a}$
a = 3, b = -80, c = 0

Δ=b2−4ac
Δ=(−8)2−4*(3)*(0)
Δ=64+0
Δ=64

$x = \frac{-(-8) \pm \sqrt{64}}{2*3} \\ \\ x = \frac{8 + \sqrt{64}} {6} \\ \\ x' = \frac{8 + 8}{6} \\ \\ x' = \frac{16}{6} \\ \\ x' = \frac{8}{3} \\ \\ \\ x'' = \frac{8 - 8}{6} \\ \\ x'' = \frac{0}{6} \\ \\ x'' = 0$

S= {$\frac{8}{3}, 0$}