Factor x2 + 4x + 4 - 9y2 by grouping.
| x2 + 4x + 4 - 9y2 = | (x2 + 4x + 4) - 9y2 | Group the first three terms together. |
| Show work. | Factor these three terms as
a trinomial. Also write the last term as a perfect square. |
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