Question 18446
y=x square is a function because for every x there is a unique image in y for example no two different values of y correspond to same value of x ........ where as the inverse equation x=square root of (y)..does not give raise to a unique image for y ..for example y=+4 can have 2 images in x namely +2 and -2.in such a case it is not called a function
we can make it a function by redefining x as equal to only
..... + square root of (y)..