Question

ab - a - b + 1 factorise
please tell me step by step​

Answer 1

Answer:

(a-1)(b-1)

Step-by-step explanation:

simon's factoring trick

Answer 2

Answer:

(a-1)(b-1)

Step-by-step explanation:

ab-b-a+1

b(a-1)-1(a-1)

(a-1)(b-1)