Question

Solve the quadratic equation 5x2 - 125 = 0.

Answer 1

first take out a gcf of 5 --> 5(x2-25) = 0
you divide both sides by 5 --> x2-25 = 0
factor (it is a difference of squares) --> (x+5)(x-5)=0
set both factors equal to zero, and solve for x --> x = 5 or x = -5