anonymous
  • anonymous
Given the function f(x) = 4(x+3) – 5, solve for the inverse function when x = 3 –21 –16 –10 –1
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
oh ok just plug it in and distribute
anonymous
  • anonymous
got that?
anonymous
  • anonymous
plug what in

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anonymous
  • anonymous
x
anonymous
  • anonymous
i did but it didnt give me one of the answers
anonymous
  • anonymous
|dw:1434112167391:dw|
anonymous
  • anonymous
thats the first step
anonymous
  • anonymous
okay then where do i go
anonymous
  • anonymous
|dw:1434112336418:dw|
anonymous
  • anonymous
thats the 2nd step
anonymous
  • anonymous
hold on rewind did it wrong
anonymous
  • anonymous
|dw:1434112506739:dw|
UsukiDoll
  • UsukiDoll
is that dividing by 0?!
anonymous
  • anonymous
im sorry im having a bad day can you take over for me
UsukiDoll
  • UsukiDoll
I can try... the problem is asking for the inverse function when x = 3 meaning we need to find \[f^{-1}(x)\] which is the inverse before we go further
UsukiDoll
  • UsukiDoll
first we can distribute and make this a bit easier f(x) = 4(x+3)-5 f(x) = 4x+12-5 f(x) = 4x+7
UsukiDoll
  • UsukiDoll
now f(x) =y y = 4x+7 we switch the x and y x=4y+7 and solve for y \[x=4y+7\] \[x-7 = 4y\] \[\frac{x}{4}-\frac{7}{4} = y\]
UsukiDoll
  • UsukiDoll
now we are given that x = 3 so we plug it in \[\frac{3}{4} -\frac{7}{4} = y\]
UsukiDoll
  • UsukiDoll
we can subtract the numerator since we have 4 as the same denominator
UsukiDoll
  • UsukiDoll
\[\frac{-4}{4} = y\] \[-1=y\]
anonymous
  • anonymous
thank you

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