exam Maths Puzzle Numerical Ability

what is the answer to the question I need the formula for the funtion of those please.

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Divide 45a^6b^10 over 5a^3b^2.
My answer 5a^3b^5. I have a question that states: use the even and odd powers of (x-c) Theorem to determine where the graph of the given polynomial will cross the x-axis and where the graph will intersect but not cross the x-axis. y=x(x-4)^2