I√5
Find the square of the imaginary number.

=  

Step-by-step explanation:

First, reorder the terms:

Then, find the complex conjugate (a pure imaginary number is its opposite):

since both sides equal, there are infinitely many olutions.

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.