book Maths Puzzle Numerical Ability

I need to know which of these is true and false i keep trying and reading the definition of polynomials ect and still can't figure out which one is true and which is false.


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book Other Question
{(x+2)-y}{(X+2)+y}

is this a perfect square Please help me to simplify the following fraction:
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(x^3+2x^2y+2xy^2+y^3)(3x^2+8x-3)
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(3x^2-x+3xy-y)(x^4+3x^3-xy^3-3y^3)