Given the function f(x) = 4(x+3) − 5, solve for the inverse function when x = 3.

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−16

−10

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Can you please help me out with this question? @jim_thompson5910

Question

Given the function f(x) = 4(x+3) − 5, solve for the inverse function when x = 3.

 −21

 −16

 −10

 −1
Can you please help me out with this question? @jim_thompson5910

jim_thompson5910 · Answer

this is another (possibly more convoluted) way of asking you to solve 3 = 4(x+3) - 5

jim_thompson5910 · Answer

this is because when you solve for the inverse, you end up swapping x and y (and then solving for y)

anonymous · Answer

oh ok i didnt pay attention to the question.. i thought they were asking to solve for f(x) and that's it

jim_thompson5910 · Answer

that's if they asked you to find f(3)

anonymous · Answer

yeah, i understand but i'm kind of having trouble solving for inverses

jim_thompson5910 · Answer

do you know how to solve 3 = 4(x+3) - 5?

anonymous · Answer

yes i do

jim_thompson5910 · Answer

what do you get

anonymous · Answer

19

jim_thompson5910 · Answer

incorrect

anonymous · Answer

how? i plugged it 3 for the x which is 4(3+3) -5 so whats inside the parantheses is 6 and 4 times 6 is 24 so 24-5 = 19

jim_thompson5910 · Answer

no you don't plug 3 into x

anonymous · Answer

oh then i was doing this wrong the whole time.. wow lol

anonymous · Answer

so can u help me get this whole thing plz?

jim_thompson5910 · Answer

3 = 4(x+3) - 5

3 = 4x+12 - 5

3 = 4x+7

4x+7 = 3

do you see how to finish up?

anonymous · Answer

how did u get 7?

jim_thompson5910 · Answer

12-5 = 7

anonymous · Answer

oooh oh ohh ok lol thank you so much! that was very helpful!

jim_thompson5910 · Answer

you're welcome