Given f(x) = the quantity of 2x plus 4 divided by 5 solve for f-1(3).

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Question

Given f(x) = the quantity of 2x plus 4 divided by 5 solve for f-1(3).

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anonymous · Answer

@ganeshie8

anonymous · Answer

x = 3

2(3) -2/ 4

6 - 2
 = 4

4/4  = 1?

anonymous · Answer

f(x) = $$2x - 2 \over 4$$

ganeshie8 · Answer

check ur f(x) again,

in the wording u said :
f 2x plus 4 divided by 5 

but in the equaiton u have a minus

anonymous · Answer

its minus

anonymous · Answer

it like converted my equation into words for some reason...  the equation i posted is the correct one

ganeshie8 · Answer

okie, they want u find f^-1(3)

ganeshie8 · Answer

not f(3)

get that difference first

ganeshie8 · Answer

f^-1(3) and f(3) are two different things

anonymous · Answer

yeah I want f^-1(3)

ganeshie8 · Answer

f^-1(3) means
for wat value of x, the function f(x) becomes 3

ganeshie8 · Answer

$\large  f(x)   =  \frac{2x - 2}{4}$

ganeshie8 · Answer

$\large 3   =  \frac{2x - 2}{4}$

ganeshie8 · Answer

solve x

anonymous · Answer

so..  would I add 2?

anonymous · Answer

im a little confused lol

ganeshie8 · Answer

first multiply 4

ganeshie8 · Answer

$\large  3    =  \frac{2x - 2}{4}$

mutiply 4  both sides


$\large  12     =  2x - 2$

ganeshie8 · Answer

rest shud be easy :)

anonymous · Answer

add 2?

14 = 2x

/2

x = 7?

ganeshie8 · Answer

thats it ! 
remember below :-
1) f^-1 means they want u find x
2) f means they want u find f(x)

anonymous · Answer

alright thanks man :)