Factorise 15-5a
simplify:
3 x k x k - 3 x k
5k(2) - 2k + 2k(2) - 5k
(3+k)(3+2k)
thanks
You've answered your OWN question???
15 - 15a = 15 (1 - a)
3 x k x k - 3 x k = 3K^2 - 3k
(3+k)(3+2k) = 9 + 6k + 3k + 2k^2 using distributive property
= 2k^2 +9k +9