The factors of a2+b−ab−a are __________
(a - b) (a - 1)
(a + b) (a - 1)
(a + b) (a + 1)
(a - b) (a + 1)
a2+b−ab−a
=a2−a+b−ab
= a(a−1)+b(1−a)
= a(a−1)−b(a−1)
= (a−b)(a−1)
Factors of a2−b+ab−a are
Factorise the term a2+bc+ab+ac