Question

I'm confused on something
can anyone help? for medal?

Answer 1

Which function below is the inverse of f(x) = The quantity of three x plus five, over seven.?

Answer 2

f−1(x) = The quantity of seven x minus five, over three
f−1(x) = The quantity of seven x plus five, over three
−f−1(x) = Seven over the quantity of three x plus five
f−1(x) = Seven over the quantity of five minus three x

Answer 3

\(\dfrac{3x+5}{7}\) ?

Answer 4

yes :)

Answer 5

@DJthereal
here's something i need help on

Answer 6

@LynFran

Answer 7

option First. want solution?

Answer 8

LOL, i'm lost? what do you mean whats the solution
A. f−1(x) = The quantity of seven x minus five, over three
B. f−1(x) = The quantity of seven x plus five, over three
C. −f−1(x) = Seven over the quantity of three x plus five
D .f−1(x) = Seven over the quantity of five minus three x

Answer 9

A is correct! solution means how to get it!

Answer 10

whats tha equation??

Answer 11

nvm i see

Answer 12

A sounds good. but y A?

Answer 13

i think its B or A

Answer 14

@DJthereal same but i think someone needs to show me how to find the answer. i have a test coming up soon. thats why i'd ask why it's A.

Answer 15

1 sec...i had a problem similar to this but i can't find my old notebook

Answer 16

\[f(x)=\frac{ 7x-5 }{ 3}\\ switch \ x\ and\ f(x)\\ x=\frac{ 7f(x)-5 }{ 3 }\\solving \ for\ f(x)\\f(x)=\frac{ 3x+5 }{ 7}\\putting\ f(x)= inverse\ f(x)\\ \therefore \ inverse\ f(x)= \frac{ 3x+5 }{ 7 }\]

Answer 17

thats A??

Answer 18

wait which one did @eninone jus solve??

Answer 19

what are tha answer choices??

Answer 20

oh! no ! a plus sign missed! hey! @nerlineg check out my solution, Option A is Correct.

Answer 21

\[given\ f(x) = \frac{ 3x+5 }{ 7}\\ switch\ x\ and \ f(x)\\ i.e. x \ becomes\ f(x) \ and \ f(x) \ becomes\ x\\ x=\frac{ 3f(x)+5 }{ 7},\ solve\ for\ f(x)\\7x=3f(x)+5\\7x-5=3f(x)\\f(x)=\frac{ 7x-5 }{ 3 }\\replace\ f(x) \ by\ inverse\ f(x)\\i.e.,\ inverse\ f(x)=\frac{ 7x-5 }{ 3 }\\clearly\ option\ A \ is\ Correct!\]

Answer 22

Yes, @eninone has the correct solution.

Answer 23

yeah, my teacher did a typo, but yup you are right thanks ! i actually do understand it now. with everyone's help on here ! @eninone @
DJthereal

Answer 24

@DJthereal

Answer 25

You should read 'How to Sove it' by George Polya.
https://en.wikipedia.org/wiki/George_P%C3%B3lya
http://www-history.mcs.st-andrews.ac.uk/Biographies/Polya.html