Question

Write in the expanded form: (3a-2b-3c)²
please do it and show me...​

Answer 1

Answer:

using (a+b+c)^2 = (a)^2 +(b)^2 +(c)^2 +2ab+2bc+2ac

Step-by-step explanation:

1. (3a)^2 + (-2b)^2 +(-3c)^2 + (2×3a×(-2)b + 2×3a×(-3)c + 2 × (-2)b × -3c
2. 9a^2 + 4b^2 + 9c^2 -12ab -18ac + 2 × (-2)b × (-3)c
3. 9a^2 + 4b^2 + 9c^2 -12ab -18ac + 2 × 6bc
4. 9a^2 + 4b^2 + 9c^2 -12ab -18ac + 12bc

Hope to you that you can understand easily