Question

3
9
Factorise the following expressions by regrouping.
1. ab + 4a + 3b + 12
6. 10x2 - 4xy + 15x - 6y
2.
mn + 4m-n-4
7. xy + 3x - 3y - 9
3. 4mn - 2m + 2n-1
8. -8ab + 16a + 4b-8
4. 15am + 3an + 5bm + bn
9. -12ax - 9a - 4x - 3
5.
ax + bx + ay + by
10. -7ax - 7ay - 9x - 9y​

Answer 1

Step-by-step explanation:

sorry.... now I can't do these many

but I will do 1st one for you....

1. ab+4a-3b-9

a(b+ 4)-3(b+4)

(b+4)(a-3)