exam Maths Puzzle Numerical Ability

please help solve

factor by grouping

4+xy-2y-2x

i am not sure how you know how to pair them up

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exam Other Question

evaluate the following:and identify the domain

Functions for the problem: f(x)= 2x^2+5x+7 and g(x)=x^3+2

1. (f+g)(x)
2. (f-g)(x)
3. (g.f)(x)
4. (f/g)(x)
solve and graph the following inequality

3x-4y<12