anonymous
  • anonymous
If f is a function such that f(2)=4, which of the following could be f^-1, the inverse function of f?
Algebra
katieb
  • katieb
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ganeshie8
  • ganeshie8
`which of the following...` where are they ?
anonymous
  • anonymous
(a) = (sqrtx) +2 (b) x^2 (c) (1/2)x (d)2^x
ganeshie8
  • ganeshie8
f(2) = 4 when u feed in 2, it is spitting out 4 so the inverse function must do the exact opposite : when u feed in 4, it must spit out 2

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ganeshie8
  • ganeshie8
plugin x=4 in each of the options and see which one evaluates to 2
anonymous
  • anonymous
c?
ganeshie8
  • ganeshie8
Yep!
anonymous
  • anonymous
So for these types of questions, all we have to do is just plug them in?
ganeshie8
  • ganeshie8
that will do, i don't see any other way
anonymous
  • anonymous
Great, thank you!
ganeshie8
  • ganeshie8
yw! just remember that if (a, b) is a point on f(x), then (b, a) will be a point on its inverse function.

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