6a2-24ay

Assuming you meant 6a^2 - 24ay:

• Common factor is 6a.
• Factor: 6a^2 - 24ay = 6a(a - 4y).

Check: 6a · a = 6a^2 and 6a · (-4y) = -24ay. So the factorization is 6a(a - 4y). If you prefer, it’s also -6a(4y - a).