-20 20
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The two square roots of 400 are: 20 and -20.
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
The two square roots of 18 are: 4.242641 and -4.242641