If you mean: x^2 +5x +4 then it is (x+4)(x+1) when factored
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2x + 7 + 5x - 4 - x = (2x + 5x - x) + (7 - 4) = 6x + 3
The factors of x2 + 5x + 4 would be (x + 1) and (x + 4)
(x+1)(x+4)
4 + 5x = 1 5x = 1 - 4 5x = -3 x = -3/5 x = -0.6
5x2 + 20x = 5x (x + 4)