- #1

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- Homework Statement
- See attached

- Relevant Equations
- Complex numbers

The problem is as shown...all steps are pretty easy to follow. I need help on the highlighted part in red. How did they come to;

##z^4+8z^2+16-9z^2=0## or is it by manipulating ##-z^2= 8z^2-9z^2?## trial and error ...

##z^4+8z^2+16-9z^2=0## or is it by manipulating ##-z^2= 8z^2-9z^2?## trial and error ...