Solve Square Root Equations with Extraneous Solutions | Radicals | Eat Pi

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In this video I teach you how to solve square root (radical) equations that have extraneous solutions. I go over 2 examples, the second of which I show you how to solve by factoring.

0:00 - 13+sqrt(15n) = 3
2:06 - r+4 = sqrt(-4r-19)

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Sqrt (1) can be +1 or -1. So if we consider the -1 as the sqrt then the solution works. Hiw domwe explain this?

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