book Maths Puzzle Numerical Ability

ordered pairs for the solution of x-y=4

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book Other Question

Each of the three dimensions of a cube with a volume of y^3 cubic centimeters is decreased by a whole number of centimeters. If the new volume is
y^3-13y^2+54y-72 cubic centimete
Find the x-intercepts for y=x^3(x+2)(3x-1)