Question

given f(x)=x^2-5 and g(x)=20-x find (f-g)(2)

Answer 1

f-g = x^2-5 - (20-x)

f-g = x^2 -5-20+x

f-g = x^2 +x-25

f-g(2) = 2^2 +2 -25

      = 4+2-25

     = -19