book Maths Puzzle Numerical Ability

evaluate eachof the following if a=3 and b=4.
(a-b)4 (3-4)3=-1 =3

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book Other Question

my question says:
solve 6m-5n=-14 for m
i solved this and got m=5n-14 over 6 i'm not sure if this is right, and also what do you do with the 6 if this is right?
thanks for yo
I NEED HELP WITH FACTORING THIS:
18C^4 - 9C^2 + 7C