sarahc
Let f(x) = 5x + 12. Find f–1(x).



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LordVictorius
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I was also confused on these.

LordVictorius
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Switch y and x, y being f(x)

mathsmind
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is this question about finding the inverse of a function?

LordVictorius
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Yes.

LordVictorius
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f1(x)

LordVictorius
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f^1

mathsmind
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\[y = 5x +12\]

LordVictorius
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Yes.

LordVictorius
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x=5y+12

mathsmind
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\[x = 5y +12\]

LordVictorius
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Solve for x.

LordVictorius
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lol

LordVictorius
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x12=5y

LordVictorius
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(x12)/5=y

mathsmind
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\[5y = x 12\]

mathsmind
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\[y = \frac{ x12 }{ 5 }\rightarrow f ^{1}(x)=\frac{ x }{ 5 }\frac{ 12 }{5 }\]

LordVictorius
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Too late, I got it.

LordVictorius
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I GTG.

LordVictorius
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Good luck math.

mathsmind
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\[y = \frac{ 1 }{ 5 }(x12)\]

sarahc
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so it would x12/5?

mathsmind
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yup

sarahc
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thanks!

mathsmind
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you are welcome but follow the steps

mathsmind
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so you can do it yourself

mathsmind
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if you practice the steps i showed you, you'll almost be able to solve any problem of the kind

sarahc
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okay I did. I got 100 :)

LordVictorius
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Good for you.

mathsmind
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did u get 100%

mathsmind
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good i am happy

LordVictorius
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Thanks.

mathsmind
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sorry i was busy in the computer science section

LordVictorius
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lol

LordVictorius
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Anyway, can you help me?

LordVictorius
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I posted my questions.

mathsmind
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sure what is ur qs? if i know how to solve it?

LordVictorius
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Bumping now.

mathsmind
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so where is the question

LordVictorius
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It should be the third one down.