exam Maths Puzzle Numerical Ability

I have a problem

If f(x)=x(x+1)(x-4) use interval notation to give all values of x where f(x)>0

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exam Other Question

Please help me solve this equation. It has been awhile.
3/4 + 7/y = 9 Find a value for k so that 9m(squared)- kn(squared) will have the factors 3m + 7n and 3m - 7n.

thanks