exam Maths Puzzle Numerical Ability

f(x)=2x^2-x+7 ; g(x)=x-1

find (f-g)(x)

I don't know if I am to just subtract or put in the proper way. I am lost.

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exam Other Question

10 squared plus 26 squared= C2- show me how to come up with the answer Biologists catch, mark and then release 356 fish. One week later, they catch 629 fish and of that group 85 are marked. Use the information to estimate the total population of fish in the lake.