Factor and solve: z^2 -20z+64=0

Asked by AnneS2 12 years ago 9/20/2013 5:52 AM

Last updated by anonymous 12 years ago 9/21/2013 4:05 PM

Answered by CherieS 12 years ago 9/21/2013 4:05 PM

z^2 -20z+64=0

(z )(z ) ( -16)( -4)=0

(z-16) (z-4) = 0

Solve:

(z-16)=0

z-16+16=0+16

z=16

Solve:

(z-4) = 0

z-4+4 = 0+4

z=4