How would i find the inverse?

Question

#g(x)=3x+9#

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Answer 1 · 2018-05-21T16:50:58

#g(x)^-1=(x-9)/3#

Remember that #g(x), f(x)#, etc means a function or a given equation.

Set to #y#:

#y=3x+9#

#rArr y-9=3x#

#rArr (y-9)/3=y#

Substitute #y# for #x#:

#rArr (x-9)/3#