x^2 + 13x + 30 = 0
x^2 + 10x + 3x + 30 = 0
x(x + 10) + 3(x + 10) = 0
(x + 3)(x + 10) = 0
x = -3 or x = -10
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(x + 10)(x + 3)
x2 + 13x = -30 ∴ x2 + 13x + 30 = 0 ∴ (x + 3)(x + 10) = 0 ∴ x ∈ {-3, -10}
-2(2x^4 - 13x^3 + 15)
There's a factor pair of 30 that adds up to 11. (x + 5)(x + 6)