(z-6)²-(z-8)(z-8)+(z+8)
(z²-12z+36)-(z²-8z+64-8z)+z+8
z²-12z+36-z²+8z-64+8z+z+8
5z-20
5(z-4)
5(1/3-4)
5*(-3)
5*-
-18
(z-6)²-(z-8)(z-8)+(z+8)
(z²-12z+36)-(z²-8z+64-8z)+z+8
z²-12z+36-z²+8z-64+8z+z+8
5z-20
5(z-4)
5(1/3-4)
5*(-3)
5*-
-18