 algebra help? - XP Math - Forums Sign Up FREE! | Sign In | Classroom Setup | Common Core Alignment  XP Math - Forums algebra help? 07-30-2007 #1 ninjaadam Guest   Posts: n/a algebra help? Find the inverse of f(X)1.) f(X) = 5X + 42.) f(X) = X^2 + 33.) f(X) = -5X+ 2 4.) f(X) = 3X-1 -- ------ 4on the last question, the ( ------- 4) goes under 3X - 1. 07-30-2007 #2 BeyondMyDreams Guest   Posts: n/a 1. y= 5x +4 y - 4 = 5x y-4 /5 = x x - 4 /5 = y = f(x)2. y = x^2 + 3 y - 3 = x^2 extract the root from y - 3 = x root x-3 = y = f(x)The other are easy when you know understand the way to solve. 07-30-2007 #3 Another lazy kid Guest   Posts: n/a Do you mean additive inverse or multiplicitive inverse? I'm not sure right now, but wouldn't the multiplicitive inverse be the denominator (bottom number)over the numerator (top number)? If so, wouldnt the invrse of f(x) simply be f(x)=1/[f(x)] ( in the case of the last one, note that 1/[f(x)] would equal 4/(3x-1))?I am not a mathemetician, nor do i like Algebra, but I think your question was a bit vauge. Sorry I couldn't help much.

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