Question

Resolva:

A) (x+2)^2=4

B) (x-3)^2=9

Answer 1

a
( x + 2)² = 4
(x)² + 2.2.x + 2²   = 4   ou   x² + 4x + 4= 4   
x² + 4x + 4 -  = 0
x² + 4x = 0
x( x + 4) = 0
x = 0 ***
x + 4 = 0
x = -4 ****
b

( x - 3)² = 9
 (x)² - 2.3 .x + 3²  = 9
x² - 6x + 9 - 9 = 0
x² - 6x = 0
x( x - 6) = 0
x = 0 ***
x - 6 = 0
x = 6 ****