Use discriminant if the given equation can be factored, otherwise, use he quadratic formula to solve this equation.
discriminant = b² - 4ac
In this case the discriminant is greater than zero, so it can be factored:
8 (x-3/4) (x+4)
In case you are asked the roots of this equation, equate the factors to zero, then solve fore x:
the roots are:
x-3/8 = 0
x = 3/8
x+4=0
x = -4