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 Depdendent Variable

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 Dependent Variable

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# Math Worksheet

1.
(a) State the definition of a one-to-one function.

(b) State the definition of an inverse function.

2. Determine whether the following functions are one-to-one.

3. If f is a one-to-one function such that f(2) = 9, what is f -1(1)?

4. If ,find  f -1(1)

5. find a formula for the inverse of a function. Sketch the graphs of the function and its
inverse and verify that you have found the inverse correctly.

6. Find

7.
(a) If we shift a curve to the left, what happens to its reflection about the line y = x?
In view of this geometric principle, find an expression for the inverse of g (x) =
f (x + c), where f is a one-to-one function.

(b) Find an expression for the inverse of h (x) = f (c x), where c ≠ 0

8. (a) If f is a one-to-one, twice differentiable function with inverse function g, show
that

(b) Deduce that if f is increasing and concave upward, then its inverse function is
concave downward.

9. Recall the following theorem from the text.

Theorem. If f is a one-to-one differentiable function with inverse function g = f -1
and , then the inverse function is differentiable at a and

The purpose of this problem is to guide you through the proof of this theorem.

(a) State the definition of the derivative of g at the point x = a.

(b) Using the definition of an inverse function and that g (x) = y, g (a) = b find  f (y)
and f (b).

(c) Rewrite the definition from part (a) using the notation in part (b).

(d) Why is g = f -1 continuous? So, if x→a then g (x)→?

(e) Use the limit laws to recognize that

(f) Finally, use the notation of part (b) to rewrite the result obtained in (e) to get
the desired result.