Question

resolva 2( x - 2) = 5x( x- 2)

Answer 1

Explicação passo-a-passo:

2( x-2) = 5x (x -2)

2x -4 = 5x² - 10x

- 5x² +2x +10x -4=0

- 5x² +12x -4=0 (×-1)

5x² - 12x +4=0

∆= (-12)² - 4.5.4

∆= 144 - 80

∆= 64

x= - (-12) ±√64/2.5

x= 12 ±8/10

x1= 12+8/10

x1= 20/10

x1= 2

x2= 12-8/10

x2= 4/10

x2= 2/5