Factor and check: z^2 -16z+55=0

z^2 -16z+55=0

(z )(z ) ( -11)( -5)=0

(z-11) (z-5) = 0

Check:

(z-11) (z-5) = 0

(z)(z) (z)(-5) (-11)(z) (-11)(-5)=0

z^2 -5z -11z +55=0

z^2 -16z +55=0