Thursday

September 18, 2014

September 18, 2014

Posted by **Erica** on Monday, December 6, 2010 at 3:21am.

- Calc -
**MathMate**, Monday, December 6, 2010 at 7:58amTo find an inverse, follow the three step process,

1. Rerite the function from y=f(x) as x=f(y).

2. Solve for y in terms of x, if possible.

3. Verify that f(f^{-1}(x))=x

1. y = (x+2)/x becomes x=(y+2)/y

2. Solve for y in terms of x:

xy=y+2

y(x-1)=2

y=2/(x-1)

3. Calculate

f(f^{-1}(x))

= f(2/(x-1))

=2/(x-1)+2)/(2/(x-1))

=x, therefore inverse is correct

The inverse exists only if the function is one-to-one and onto on the domain.

See illustration and note that the function is one-to-one on its domain, and that the inverse intersects the function at x=y:

http://img574.imageshack.us/img574/5812/1291623706.png

**Answer this Question**

**Related Questions**

Pre-Calc - Does y=1/x have an inverse? It is a one-to-one function, so it should...

Calc - range of f(x)= 5^(2x^2-1)^(1/2) i know that the domain of the inverse ...

Calc - Find the inverse of y = ln (x/(x-1))

Calc - how do you find the inverse of f(x)=6x+10x^17

inverse - find f^-1 (x). (this is asking me to find the inverse) f(x) = -(x-2)^2...

pre-calc - find the inverse of the function f(x) = x^2 − 6x, x ≥ 3

Inverse of log function - Find the inverse of f(x) = log(2+x) - 4 the base is "a...

calc - d/dx of taninverse e^3x i know tan inverse is 1/1+x^2 but im not sure ...

Calc - Let f(x) = x^3 - 7x^2 + 25x - 39 and let g be the inverse function of f. ...

algebra/trig - 1. f(x)=x^3+5 does f(x) have an inverse? if so, find the inverse ...