If you can't factor it easily, use the quadratic formula.
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4x2+50x = 0 4x(x+12.5) = 0 x = 0 or x = -12.5
4x2+49x+90 = (4x+9)(x+10) when factored
4x2 - 13 x + 3 = 0 (4x - 1)(x - 3) = 0 x = 3, 1/4
-((4x + 1)(x - 1))
(4x - 32)(x - 2) so x = 2 or 8