Best Answer

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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Q: How do you factor a to the second power plus 81?
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