Find the difference of the functions and simplify

[From: ] [author: ] [Date: 12-04-29] [Hit: ]

Let f(x)=x^2-81and g(x)=x+9
problem:(f-g)(x)=

by definition (f-g)(x) = f(x) - g(x).

So (f-g)(x) = x^2 - 81 - (x+9)
= x^2 -81 - x - 9
=x^2 -x-90

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