Q. I am having trouble with this Find the values, so all statements are true x/z=-z

Hi nat.j@hotmail.com,

Do you have a little more context?  What you've sent us graphs a parabola that looks like this:

http://www.wolframalpha.com/input/?i=x%2Fz%3D-z

It can also be re-written as:

x/z + z = 0

or

x = -z(2) -- (i.e. negative Z squared)

This is interesting though, because for positive values of X, some solutions require taking the square root of a negative number.

So let's set x=4

can then rewrite it so that

4 = -z^2  (to the power of 2)

If you guys are working with complex/imaginary numbers, then that may be more in line with what your teacher is trying to get you to work on.

Hope that helps!