book Maths Puzzle Numerical Ability

how do i graph an equation such as y=-2Xsquared.(sorry i don't know how to type in squared.)

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A pair of jeans sells for $36 after a 25% discount. What is the original price of the jeans?
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