book Maths Puzzle Numerical Ability

Factor completely: 36(x^4)y + 12(x^3)y^2 - 15(x^2)(y^3)

Thank you
D. Scarfone

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book Other Question

could you explain the steps on how to do it? for example A=20 C=29 the line y=3/5x + 1/4 intersects the line y=-1/8x + r at the point (-1/2,-1/20) for what value of r?