2x2+13x+15 = (2x+3)(x+5)
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-2(2x^4 - 13x^3 + 15)
It cannot be factored because the discriminant of b2-4ac is less than zero.
2x^2 + 13x + 15 factored means that the two numbers must multiply to the constant (15) and add to equal the coefficient on the X (13). So it becomes: (2x + 3) (x + 5). If expanded, 2x*5 = 10x and 3 * x = 3x which add to 13x. And 5 * 3 = 15
2x2 + 11x + 15 = (x + 3)(2x + 5).
13x + 15 = 11x - 5 2x = -20 x = -10