tolongggg dongggg yg di buletinnnnn

1 a) 12m-18n = 6(2m-3n)
b) 9xy^2+15x^3 =
3x(3y^2+5x^2)
3 c) 121-k^2 =
11^2-k^2
(11-k)(11+k)
5 b) 16a^4-625 =
16a^4-5^4
(4a^2 - 5^2)(4a^2+5^4)
c) 12x^2 - 72 =
12(x^2-6)