Factorise
(a +3) ^2 - 9
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Answer:
(a+3) ^2-9
(a+3) (a+3) -9
a(a+3) +3(a+3) -9
a^2+ 3a + 3a +9-9
a^2 + 3a + 3a
a^2 + 6a
a(a+6)
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