exam Maths Puzzle Numerical Ability

Rewrite the expression x^3 - 2x^2 y + x y^2 so that it is easy to calculate the its value without a calculator when x= 21 and y = 19

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exam Other Question

what is the answer to this question [[[x]-2]-2]<=1 Solve the equation

w^3 + 5w^2 - w = 5