exam Maths Puzzle Numerical Ability

Find a value for k so that 9m squared - kn squared will have the factors 3m + 7n and 3m - 7n

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exam Other Question

Hi could you help me analyze this rational function?

For each rational function, identify any holes or horizontal or vertical asymptotes of its graph.

y=x/(x-3)

thank you simplify: x^2+2x+1-y^2/(x+1)^2+2y(x+1)+y^2