Question

Factorise : z - 7 + 7xy - xyz

Answer 1

Answer:

(1-xy)(z-7)

Explanation:

z - 7 + 7xy - xyz

= z-xyz+7xy-7

=z(1-xy)+7(xy-1)

= z(1-xy)-7(1-xy)

= (1-xy)(z-7)

••••

Answer 2

Answer:

(1-xy)(z-7)

Step-by-step explanation:

1(z-7)+xy(7-z)

1(z-7)-xy(z-7)

= (1xy)(z-7)