Question

(x+2)²-4=0

Answer 1

(x + 2)² = 0 + 4

(x + 2)² = 4

(x + 2)² = 2²

x + 2 = 2

x = 2 - 2

x = 0

Answer 2

<=> (x + 2)^2 = 0 + 4

<=> (x + 2)^2 = 4

<=> (x + 2)^2 = 2^2

<=> x + 2 = +2 hoặc -2

* x + 2 = 2 

<=> x = 0

* x + 2 = -2

<=> x = -4

Vậy....

Answer 3

(x+2)² - 2²= 0

(x+2-2)(x+2+2)=0

x+2-2=0 hoặc x+2+2=0

x=0                   x=-4