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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Problem #18
Directions: Multiply the following fractions.

(2x^2-x-3)/(3x^2+7x+4) Multiplied by (3x^2-11x-20)/(4x^2-9)

Problem #38

Directions: Divide the following fract How do I square the square where needed...

x^2+2x+y^2+4y=4