Thread: Need help about functions..!

Hi all, can someone please give description about the use of composite and inverse functions with examples...? any help will be appreciated

I like to think of composit functions as one function inside another.

Consider and then is a composite function



For an inverse function, think about what the inverse of an operation is. If I square something the inverse operation is a square root. Therefore when thinking about functions i.e. then the inverse is

"Square" and "square root" are not good examples here. For example, if x= -2, then and then , not -2. That's because [itex]f(x)= x^2[/itex] is not "one-to-one"- both and give four- so it does not have a true "inverse". A better example would be "cube" and "cube root". For any real number x, .

Thanks HOI, a good point you raise.

Inverse functions only exist when a function is one to one. My example was not entirely correct, although should give you a taste of what it's all about.