Solve the equation by factoring, show all work.

5x^2=80

1 answer

5x^2 = 80.
5x^2-80 = 0,
5(x^2-16) = 0,
5(x-4)(x+4) = 0,
Divide both sides by 5:
(x+4)(x-4) = 0,
x+4 = 0, X = -4.
x-4 = 0, X = 4.