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January 31, 2015

January 31, 2015

Posted by **joey** on Sunday, February 15, 2009 at 9:05pm.

when i try f(g(x)) = x and g(f(x)) = x to show that the two functions are inverses it doesn't work because i am not left with x when i solve the equation....

much help is needed thansk

- CALCULUS -
**bobpursley**, Sunday, February 15, 2009 at 9:21pmThey must not be inverse functions.

f(x)=x^2-1

y+1=x^2

x= +- root (y+1)

g(x)=+-root (x+1)

lets try the + root

f(g)=(x+1)-1=x

g(f)=+root (X^2-1+1)=x

- CALCULUS -
**joey**, Sunday, February 15, 2009 at 10:44pmwhere did you get the (x+1) from??

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