# SOLUTION: I am not understanding these Adavanced Functions and could use some help please. f(x)=-3x-3 and g(x)=x^2+2x find (f-g)(2)

Algebra ->  Algebra  -> Functions -> SOLUTION: I am not understanding these Adavanced Functions and could use some help please. f(x)=-3x-3 and g(x)=x^2+2x find (f-g)(2)      Log On

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 Question 533206: I am not understanding these Adavanced Functions and could use some help please. f(x)=-3x-3 and g(x)=x^2+2x find (f-g)(2)Found 2 solutions by stanbon, KMST:Answer by stanbon(57963)   (Show Source): You can put this solution on YOUR website!I am not understanding these Adavanced Functions and could use some help please. f(x)=-3x-3 and g(x)=x^2+2x find (f-g)(2) = f(2)-g(2) = [-3*2-3]-[2^2+2*2] = -9-0 = -9 ======================== Cheers, Stan H. =========== Answer by KMST(1936)   (Show Source): You can put this solution on YOUR website!(f-g)(x)=f(x)-g(x) for all x. For x=2 (f-g)(2)=f(2)-g(2) You have 2 options to solve your problem: Option 1 _ You can first work with the x in the functions as they are written to generate the general expression for (f-g)(x), and substitute x=2 later. Option 2 _ You can calculate f(2) and g(2) first and then do the subtraction with the two numbers. All that's said above works similarly for (f+g), (fxg) and (f/g) Sometimes one option is easier or more convenient than the other. In your case: Option 1 Option 2