Answer:
x= ± sqrt(29)
Step-by-step explanation:
5x^2 - 55 = 90
Add 55 to each side
5x^2 - 55+55 = 90+55
5x^2 = 145
Divide each side by 5
5/5x^2 =145/5
x^2 = 29
Take the square root of each side
sqrt(x^2)= ± sqrt(29)
