exam Maths Puzzle Numerical Ability

10 squared plus 26 squared= C2- show me how to come up with the answer

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exam Other Question

Find the slope of any line perpendicular to the line through points (0,5) and (-3,-4).
I have tried to read and reread this and going over the material, please help.

Much appreciated for your time,
Barb Neely 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.