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zordoloom
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What's the question?
Katieann16
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if f(x)=4x-8, what is f^-1(x)?
MathDad72
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Let's do the same thing we did before.
Katieann16
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@zordoloom
zordoloom
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To find the inverse of any function. You start by replace the x and y variables.
So in this case, You have the original function f(x)=4x-8, f(x) is also y
So y=4x-8
Start by replacing x with y and y with x
So x=4y-8
Now solve the equation for y.
zordoloom
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So x=4y-8
Subtract the 4y from the right side and left side
You have x-4y=-8
now subtract the x from both sides
-4y=-x-8
Divide the whole equation by -4
So y=...........
Katieann16
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would it be C?
Katieann16
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A) f^-1(x)=1/2x+2
B) f^-1(x)=1/4x+2
C) f^-1(x)=1/2x+4
D) f^-1(x)=1/4x+4
zordoloom
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No
zordoloom
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1/4x+(8/4)
zordoloom
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BTW, thanks for answering my question.
zordoloom
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It's B
Katieann16
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No problem
Katieann16
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thanks for answering mine (:
zordoloom
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Yep