Question

factorise pleaseeeeeeee​

Answer 1

Answer:

1.(a-9)(a+6)

2.(a-21)(a-4)

3.-(21a-1)(3a+1)

4.(x-12)(x+2)

5.(x+2)(x-3)

6.(x-2)(x-3)

7.(3x-8)(x+2)

8.(5x+2)(x-3)

9.(21x+1)(3x-1)

10.(3x-4)(x-3)

11.(5x+3)(x-4)

12.(2x-13)(x+3)

Method:

Use the cross method.