k²-9m²= (k-3m)(k+3m)
81x²-y²=(9x-y)(9x+y)
27x+3y=3(9x+y)
d²-4d+4=(d-2)^2
6d-12=6(d-2)
2a-2=2(a-1)
a²-2a+1=(a-1)^2
x²+8xy+16y²=(x+4y)^2
3x+12y=3(x+4y)
k²-9m²= (k-3m)(k+3m)
81x²-y²=(9x-y)(9x+y)
27x+3y=3(9x+y)
d²-4d+4=(d-2)^2
6d-12=6(d-2)
2a-2=2(a-1)
a²-2a+1=(a-1)^2
x²+8xy+16y²=(x+4y)^2
3x+12y=3(x+4y)