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4a2+ 25 does not factor over the real number field. In the complex numbers , it

factors as (2a +5i)(2a - 5i).

This is because i2 = -1, so 4a2 + 25 = 4a2 - (- 25) = 4a2 - 25(-1) = 4a2 - 25i2

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โˆ™ 2010-12-08 03:16:33
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โˆ™ 2015-07-25 21:54:12

(2a = 5i)(2a - 5i) where i is the square root of -1

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Q: How would you factor 4a2 plus 25?
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