The two square roots of 400 are: 20 and -20.
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20. * * * * * Sort of. ± 20 are the square roots (not rout!) of 400.
Nine :) * * * * * Sort of. ± 9 are the square roots (not rout!) of 400.
300
-20 20
0.0625 has a grand total of 2 square roots, and they're both real. They are +0.25 and -0.25