1

2

8

15

$$-2,\ 12$$  

$$-6,\ -4$$  

$$2,\ -12$$  

$$-6,\ 4$$  

$$(w-6)(w+2)$$  

$$(w-4)(w+3)$$  

$$(w-6)(w-6)$$  

$$(w+4)(w-3)$$  

$$(x+12)(x-2)$$  

$$(x-4)(x-6)$$  

$$(x+10)(x-2)$$  

$$(x-2)(x-8)$$  

$$(x+4)(x+3)$$  

$$(x+2)(x+3)$$  

$$(x+4)(x+2)$$  

$$(x+5)(x+1)$$  

$$(x+12)(x-3)$$  

$$(x+9)(x-4)$$  

$$(x-9)(x-4)$$  

$$(x-12)(x+3)$$  

(a - 4)(a + 3)

(a + 6)(a - 4)

(a - 6)(a + 4)

(a + 4)(a - 3)

(n - 2)(n - 3)

3(n + 2)(n + 3)

(3n - 9)(n - 2)

3(n - 3)(n - 2)