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If f(x)=3x+9,what is f−1(x)?
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If f(x)=3x+9,what is f−1(x)?

User Nihar
by
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1 Answer

4 votes
f inverse? then :
let's consider 3x + 9 as y.
so :
y = 3x + 9
y - 9 = 3x
x = y/3 - 3
now replace y with x and you get the inverse.
f^-1 (x) = x/3 - 3
User Andrew Weir
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