The factors of 15 are 1, 3, 5, 15. There are two factor pairs.
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15 3, 5
It is: 2/3 times 15 which is the same as 2/3 of 15 = 10
1 times 15 3 times 5 -1 times -15 -3 times -5
(4 times 3) plus 2 plus 1
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 )