Question

Factorise the expression:z^2-12z+27​

Answer 1

Answer:

(z-3)(z-9)

Step-by-step explanation:

z^2-12z+27

=z^2-9z-3z+27

=z (z-9)-3 (z-9)

=(z-3)(z-9)

Answer 2

z^2 - 12z + 27 = 0

z^2 - 9z -3z +27 = 0

z( z -9) - 3 ( z - 9) = 0

(z-3) (z-9) = 0

z= 3 or z= 9