Question

Factorise:1 + a + b − c + ab-
bc — ca - abc​

Answer 1

Answer:

1-c+a-ca+b-bc+ab-abc

1(1-c)+a(1-c)+b(1-c)+ab(1-c)

(1-c)(1+a+b+ab)

either 1-c=0

c=1

1+a+b+ab=0