2a2 - 13a + 15 = (2a - 3) (a - 5)
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(2x+1)(2x+3) when factored
3x2-39x-90 = (3x+6)(x-15) when factored
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
positive 10
Its 91