book Maths Puzzle Numerical Ability

solving quadratic equations by factoring:

(x+5)(x+4)=0

2h^2-h-3=0

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book Other Question

graph the solution set of the system of inequalities:
{x^2 + y less than or equal to 25}
{y less than or equal to x^2 + 2}

i get as far as y=mx+b
y=-x^2+25
y=x^2+2 can someone please check my answers to: factor the sums or differences of two cubes

m^3-n^3
MY ANSWER m^3-n^3=(m-n)(m^3+mn+n^3)

c^3+f^3
MY ANSWER c^3+f^3=(c+f)(c^3-cf-f^3)