SOLUTION: Solve using square roots: -12 = x^2 - 21

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Question 429421: Solve using square roots:
-12 = x^2 - 21

Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
21+-+12+=+x%5E2
9+=+x%5E2
==> x = -3, 3