Question

x la puterea a 2 +3=12

Answer 1

x²+3=12
x²+3-12=0
x²-9=0
(x-3)(x+3)=0
x-3=0; x=3
x+3=0; x=-3
Spor la lucru!

Answer 2

x^2+3=12
x^2=9
√(x^2) =√9
|x|=3
x={-3;3}