For basic polynomials I would recommend using the factoring method, find factors that multiply up to 48
1 and 48, 2 and 24, 4 and 12, 6 and 8
I know that -6 + -8 = -14 and (-6)(-8) = 48
So we can solve it by setting up a factored expression
(x - 6)(x - 4) so the solutions are 6 and 4