book Maths Puzzle Numerical Ability

(5x^-4y^-6z^5)(-4x^5y^5z^-3)(-4x^2yz^-1)

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book Other Question

If the sides of a square are decreased by 2 cm, the area is decreased by 36 cm^2. What were the dimensions of the original square? I am having some difficulty with this problem...
Could you please help?
List all of the potential rational zeros of the polynomial function.Do not attempt to find the zeros. f(x)