exam Maths Puzzle Numerical Ability

please help me with this problem.
simplify. sq rt 500

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exam Other Question

Please help solve the following questions from ch. 5 exersie 5.5
thanks,
Sarah 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.