Question

Cum calculez x^2=64
2x^2=8
3x^2=108
(x+1)^2=25

Answer 1

1)

x²=64

x∈{-8,8}

2)

2x²=8

x²=4

x∈{-2;2}

3)

3x²=108

x²=36

x∈{-6;6}

4)

(x+1)²=25

Cazul 1: x+1=5 => x=4

Cazul 2: x+1=-5 => x=-6

x∈{-6;4}