Question

Two questions please!

If f(x) = 5x – 3, then what is f–1(x) ?


If f(x) = 2x2 – 4x + 5 and g(x) = 2x – 2, what is f(x) + g(x) ?

Answer 1

I'd start with the first one.
Replace \(f(x)\) with \(y\).

\( \color{Black}{\Rightarrow y = 5x - 3}\)

Now replace \(x\) and \(y\).

\(x = 5y - 3\)

\( \color{Black}{\Rightarrow x + 3 = 5y}\)

\( \color{Black}{\Rightarrow {{\Large {x + 3 \over 5}}} = y}\)

\( \color{Black}{\Rightarrow f^{-1}(x) = {\Large{x + 3 \over 5}}}\)

Answer 2

Did you get what I said here?

Answer 3

I got close to it..

Answer 4

Okay. Where do you not understand this?

Answer 5

Could you help out with the 2nd one too please?

Answer 6

I appriciate you doing this..

Answer 7

You just have to add \(2x^2 - 4x + 5\) and \(2x - 2\) in the second.

Answer 8

Could you explain the answer please?

Answer 9

Do you know how to add them?

Answer 10

Not really

Answer 11

Your help would be great..

Answer 12

I am helping you. Can you add the like terms?

Answer 13

All i need is the answer and than i could review it myself i just nee to know what it adds up to.

Answer 14

I am sorry, but I am not allowed to give answers.

Answer 15

not allowed?

Answer 16

Yes, according to the Code Of Conduct.

Answer 17

lol

Answer 18

who Gaf about the code of conduct?

Answer 19

I gave the answer to the first just to give you an example.

Answer 20

Everyone does.

Answer 21

Everyone is required to follow the Code Of Conduct.

Answer 22

sure we can give answers... correct as well as incorrect ones....:)

Answer 23

Dpainc, hmm not really.

Answer 24

i give incorrect answers all the time? you want mine?

Answer 25

Heh—actually the Code doesn't allow us to answer the questions.

Answer 26

hmm.. i thought i read it well enough... maybe i gotta read it again...

Answer 27

Okay :)

Answer 28

so, i cant' give wrong answers then?

Answer 29

Nope.

Answer 30

dang... i quit...

Answer 31

lol