Question

esquaçao 2 grau, resultado dessa conta: 4+x(x-4)=x​

Answer 1

4 + x(x - 4) = x

4 + x² - 4x = x

4 + x² - 4x - x = 0

4 + x² - 5x = 0

x² - 5x + 4 = 0

∆ = (-5)² - 4.1.4

∆ = 25 - 16

∆ = 9

$x = \frac{ - ( - 5) + - \sqrt{9} }{2 \times 1}$

$x = \frac{5 + - 3}{2}$

$x = \frac{5 + 3}{2 } = 4 \\ x = \frac{5 - 3}{2} = 1$