Question

C
7) Factorise: (i) a(a - 1) - b(b-1)​

Answer 1

Answer:

(a²-a)-(b²-b)

Step-by-step explanation:

Answer 2

Answer:

(a-1)(a-b)

Step-by-step explanation:

${a}^{2} - a - {b }^{2} + b \\ = {a}^{2} - {b}^{2} - a + b \\ = a(a - b) - 1(a - b) \\ = (a - 1)(a - b)$