Question

x ao quadrado menos 90 igual a 31

Answer 1

x.x - 90 = 31

11.11 - 90 = 31

121 - 90 = 31

31 = 31

Resposta: X equivale a 11.

Answer 2

x^2-90= 31
x^2= 31+90
x^2= 121
x^2= √121
x= +- 11