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Math Problem

Find f(g(x)) , if f(x) = 2x +3 g(x) = 3/x+1 [ the / sign is drawn as a line in the book like how you would see in fractions. ]

How would you do this problem? I’d also rather have an explanation than a straight up answer so I learn this. =)

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Answer #1

6/x+1 + 3

then you open it up… which equals 3x+9/x+1

to add fractions this page might help http://www.mathsisfun.com/fractions_addition.html

Answer #2

ty – those are the steps I performed on my previously easier compositions of functions, but this problem has a fractional line running though it, and the book answer indicates 3x + 9 over x + 1 ( ‘over’ as in fraction or division line. )

but.. I guess I will just attempt to figure out these problems on my own. xD thanks anyways.

Answer #3

Oh these are compositions of functions, which relates to domain and range. Thanks anyways for trying. :O

Answer #4

I think…

= 2 (3/x+1) + 3

= 6/x+1 +3

Answer #5

I think this is slope stuff… but I dont remeber how to to… my teacher sucked

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