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Factoring within parentheses

Can I do anything with this? (a-3)^2

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Philip P. | Effective and Affordable Math TutorEffective and Affordable Math Tutor
4.9 4.9 (392 lesson ratings) (392)
If (a-3)2 is set equal something, such as (a-3)2 = 0, we could solve for the values of a.  But by itself, all we could do is expand the square:
(a-3)2 = a2 - 6a + 9