Question

Calcule o valor do discriminante △

Answer 1

x²/4 = 2x
x² = 8x
x² - 8x = 0

Δ = b² - 4*a*c
Δ = (-8)² - 4*1*0
Δ = 64
√Δ = 8

x1 = [-(-8)+8]/2
x1 = +8+8/2
x1 = 16/2
x1 = 8

x2 = [-(-8)-8]/2
x2 = (+8-8)/2
x2 = 0/2 ---> 0

Answer 2

x² - 2x = 0
 4

mmc = 4

x² - 8x = 0
  4          4

x² - 8x = 0
x(x - 8) = 0
x = 0

x - 8 = 0
x = 8

R.: x = 0 e x = 8