book Maths Puzzle Numerical Ability

Factor 3x^3 - 2x^2 - 37x - 12 given that x + 3 is one of the factors.
I really need some help thank you for your time

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how do i graph an equation such as y=-2Xsquared.(sorry i don't know how to type in squared.) ok,i am in 6hth grade and im struggleing in algebra
ok.example-

x+18=2/12
i dont get the fractions!
and i m failing math!