2x 2+13x+15 = (2x + )(x + ) since the only way to get 2 is 1 times 2.
The missing numbers must be filled with with 1 and 15 or 3 and 5 in some order, so by trial and error we get.
2x 2+13x+15 = (2x + 3 )(x + 5 )
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You have to experiment with different factors of 2, and different factors of 15. In this case, 2x2 - 11x + 15 = (2x - 5) (x - 3)
2x2 + 7x - 15 = (2x - 3)(x + 5)
What is the solution set of 2x2 + x = 15
If you mean: 2x2+11x+15 then it is (2x+5)(x+3) when factored
x2 + 8x + 15 = (x + 3)(x + 5)