Question

× 2 +18 = 22 alguém sabe?

Answer 1

x² + 18 = 22
x² = 22 - 18
x² = 4
x = √4
x = +/- 2

R.: x = 2 e x = - 2

Answer 2

$x^2+18= 22 \\ \\ x^2+18-18= 22-18 \\ \\ x^2= 4 \\ \\ x= \pm \sqrt{4} \\ \\ x= \pm2 \\ \\ \boxed{x_1= 2} \qquad \boxed{x_2= -2}$