Question

$9(x - 2y) { }^{2} - 1$
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Answer 1

✨ANSWER✨

$= 9( {x - 2y})^{2} - 1 \\ = 9( {x - 2y})^{2} - ({1})^{2} \\ = 9(x - 2y - 1)(x - 2y + 1)$

HOPE IT HELPS....☺