Question 2201
1. Take out the common factor (in this case, x-5)
(9-x)(x-5)
2. Factorise the first two terms and the second two terms:
a(x+y)+2b(x+y)
Then take out the common factor (as in question 1)
(a+2b)(x+y)
3. Factorise the first two terms and the second two terms:
m(a+b)+n(a+b)
Then take out the common factor (as in questions 1 & 2)
(m+n)(a+b)