Question

z^2-8z=9

Answer 1

A=1 B=-8 C=-9 USE QUADRATIC FORMULA

Answer 2

Quadratic formula.

Answer 3

\[z^2-8x-9=0\]
\[z^2-9z+z-9=0\]
\[z(z-9)+1(z-9)=0\]
\[(z-9)(z+1)=0\]
therefore\[z=9 or z=-1\]

Answer 4

z^2-8z+16-16-9=0
(z-4)^2-25=0
(z-4)^2=25
z-4=5 or z-4=-5
z=9 or z=-1

Answer 5

me first :P