book Maths Puzzle Numerical Ability

Hello!
I really need help understanding polynomials. Could someone help me undestand how to factor this problem?

15x^2+13x-2

Thank very much!

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book Other Question
The area of a triangle is 250 in^2. Find the lengths of its legs if one leg is 5 inches longer than the other.

i know area is 1/2bh. let x=shorter leg and x+5=longer leg so i know area=1/2*x*x+5=250 i need to solve for x. Hi I'm not sure if I picked the right topic but I am trying to solve the following system of linear inequalities graphically. The problem is
3x-y is less than or equl to 6
x is