Answer:
x = ± √20
or if you want an approximate solution correct to the nearest hundredth:
x = -4.47, 4.47.
Step-by-step explanation:
4x^2-80=0
This a quadratic equation and will have 2 solutions.
Add 80 to both sides of the equation:
4x^2 = 80
Divide both sides by 4:
x^2 = 20
Take the square root of both sides:
x = ± √20.