Question

(2х)в квадрате -18= 0

Answer 1

4x^2 - 18 = 0 
2x^2 - 9 = 0 
2x^2 = 9 
x^2 = 9/2
x = ± 3/√2

Answer 2

(2x)²-18=0
4x²=18
x²=18/4
x=+- √ 18/√4
x= +- √18 / 2 = +- √9*√2 /2 = +- 3√2/2