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Factorize: a2 + 81
It doesn't look like it in its current form, but this can be changed to be a difference of two squares which can then be factorize. However to do this, we will need to use complex numbers.
a2 + 81
= a2 - (9i)2
= (a + 9i)(a - 9i)
(where i is the square root of -1)
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