exam Maths Puzzle Numerical Ability

factor: 30xy-72y-3x^2y

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Please help me solve this problem:
the direction are as follow: Find the domain of the function, use interval notation:

f(x)= 3 divided by (x+4)
find the indicated outputs f(x)=4x^2-5x
f(0)=
f(-1)=
f(2)=