Module 4 day 11 part 6

I don’t think this makes sense I mean I can’t really understand it.
Sum of roots(z’s)=9Sum of retroprical of roots x’s
Does anyone of you understand it and thanks.

@BolunZhang So from what I see, we divided by x^2 in order to get from the first step to the second step.
Now, we made the substitution that z = x^2. Therefore, by Vieta's Theorem, we know that the sum of the roots of the 4th equation is 9/1=9.
Now, we want to know what the sum of the roots of 1/x is(Hint: look at what substitution we made.)
Hopefully I interpreted it right, and happy mathing!

@mathnerd_101
Yes you did thank you.