+0

# help with roots

0
190
1

What is the sum of all values of z such that z^2 = 12z - 7 + 9z - 5?

Sep 1, 2021

#1
+13789
+1

What is the sum of all values of z such that z^2 = 12z - 7 + 9z - 5?

Hello Guest!

$$z^2-21z+12=0\\ z=10.5\pm \sqrt{110.25-12}\\ z=10.5\pm \sqrt{98.25}\\ \sum z=20.412114+0.587886$$

$$\sum z=21$$

!

Sep 1, 2021