Answer:
Domain f(x) = R - {1}
As it is a rational expression, the denominator cannot be zero.
Now the function holds all real values except 1 for which the denominator will become zero which is undefined.
Therefore the domain will be all real numbers except 1.
1. 2(2)(3) + 3(3)(1) + 5(2)(1) = 31
2. 2(2 + (3)(1)) + 4((2)(3) + (2)(1)) = 42
there's not enough information to solve