exam Maths Puzzle Numerical Ability

The quantity p-q is a factor of how many of the following?
p(squared)- q(squared) p(squared)+ q(squared) p(cubed)-q(cubed)
p(cubed)+q(cubed)

A.none B. only one C.two only D.three only E.Four

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exam Other Question

if the graph of the function f(x)=4x^2-20x-4 intersects the graph of the function g(x)=1+4x-x^2 at the point (m,k), show that the other point of intersection occurs where x= -1/m. "To which form can a rotional number always be changed?"
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