exam Maths Puzzle Numerical Ability

I hope I am in the right section but I am completly loss with this.

If f(x)=x(x-1)(x-4)^2, use interval notation to give all values of x where f(x)>0.

a. (-infinity,0)U(4,inf

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exam Other Question
Solve (x + 5)^2 = 3 1. Find the length of a shorter leg of a right triangle if the longer leg is 10 miles more than the shorter leg and the hypotemuse is 10 miles less than twice the shorter leg.