Question

a) X
$x2 - 2x = 2x - 4$
x² - 2x = 2x -4
resolucao pfv eh urgente ​

Answer 1

Resposta:

x² - 2x = 2x - 4

x²-4x + 4 = 0

Delta = b²-4.a.c

D= (-4)² - 4.1.4 = 16 - 16 = 0

x = (b+-D^1/2)/2.a

x1= -4 + 0/2 = -4/2 = -2

x2 = -4 - 0/2 = -4/2 = -2

Portanto, x = -2