Factor 3a3 +3a2 - 27a - 27 by grouping.
| 3a3 +3a2 - 27a - 27 = | 3a2(a + 1) - 27(a + 1) | Factor a common term from
the first two terms and factor a common term from the last two terms so that the resulting two terms share a common factor. |
| Show work. | Factor the common factor from each of these two terms. |
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