Question

2x²-90=8 Como resolvo ?

Answer 1

2x^2 - 90 = 8
2x^2 =8 + 90
2 x^2 = 98
x^2 = 98/2
x^2 = 49
x = √ 49
x = 7

Answer 2

$2x^2-90=8 \\ \\ 2x^2=8+90 \\ \\ 2x^2=98 \\ \\ x^2= \frac{98}{2} \\ \\ x^2=49 \\ \\ x= \sqrt{49} \\ \\ x=7$