Book Maths Puzzle Algebra

Factorize
2x^2 + 13x + 15

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Book Other Question

What is 24 less than triple the value of g is 15 A triangular sail has an area of x^2+5x+6 square meters and a height of x+3 meters. Find the length of the sail's base.
I got this so far:
Area=x^2+5x+6m^2....I am not exactly sure if it's right or what to do from here.