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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If f(x)=x(x+1)(x-4) use interval notation to give all values of x where f(x)>0 Add and simplify: xy^3/x-y + xy^4+y^5/y^2-x^2