Answer:
Explanation:
Add the first 2 trinomials
2a - 16abc - 45 + 2a + 7abc + 11
2a + 2a - 16abc + 7abc - 45 + 11 Combine like terms
4a - 9abc + 56
Now you want to subtract this answer from the third trinomial.
6a + 6abc - 30 - (4a - 9abc +56) Remove the brackets.
6a + 6abc - 30 - 4a + 9abc - 56 Rearrange so like terms are together
6a - 4a + 6abc + 9abc - 40 - 56 Combine
2a + 15abc - 106