-- Posted by One Two Step at 10:41 pm on Dec. 8, 2008 let f(x)= 3x+5 and g(x)xsquared how do you do (f+g)(x) and (f over g)(x) -- Posted by SparklingFlower at 10:42 pm on Dec. 8, 2008 I used to know how to do this. I'm majoring in accounting. and now I'm depressed. -- Posted by AcidSilence at 10:42 pm on Dec. 8, 2008 well, subsitute. f(x)=3x+5 and g(x)=x squared. -- Posted by hi sarah at 10:44 pm on Dec. 8, 2008 (f+g)(x)   = x(x^2 + 3x + 5) = x^3 + 3x^2 + 5x (f over g)(x) = (3x + 5/x^2)x = uhh 3x + 5/x? not sure on the last one -- Posted by One Two Step at 10:44 pm on Dec. 8, 2008 Quote: from AcidSilence at 10:42 pm on Dec. 8, 2008 well, subsitute. f(x)=3x+5 and g(x)=x squared. How can I substitute for only f and g when they give the function of f and g.. -- Posted by Desertfoxel at 10:46 pm on Dec. 8, 2008 my brain hurts just by reading the equations -- Posted by rawrr at 10:47 pm on Dec. 8, 2008 beat me :[ -- Posted by Just Waiting Here at 10:47 pm on Dec. 8, 2008 You just plug them in... f(x) - 3x + 5   g(x) = x^2. The first one says (f+g)(x)  That just means you add the functions together... (f+g)(x) = f(x) + g(x) For the second one... it's... f(x)/g(x).  Just plug in the values, and those are your answers.