If you mean: 2x2+11x+15 then it is (2x+5)(x+3) when factored
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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)
What is the solution set of 2x2 + x = 15
6 + 11x - 60 =6 - 60 + 11x = -54 + 11x = 11x -54
1 + 11x =1 + 11x (this is the simplest solution you can make with available information)
12x - 5 = 11x + 5(1) add 5 to both sides:12x - 5 + 5 = 11x + 5 + 512x = 11x + 10(2) next subtract 11x from both sides:12x - 11x = 11x - 11x + 10x = 10