What is the sum of all values of z such that z^2 = 12z - 7 + 9z - 5?
Hello Guest!
\(z^2-21z+12=0\\ z=10.5\pm \sqrt{110.25-12}\\ z=10.5\pm \sqrt{98.25}\\ \sum z=20.412114+0.587886\)
\(\sum z=21\)
!
!
