Ten and negative ten.
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The square root of 10,000 is 100.
A positive number has two square roots, that is, there are two solutions to an equation like x2 = 100. The "principal square root" refers to the positive solution.
The two square roots are +70 and -70 .
The two square roots of 18 are: 4.242641 and -4.242641
0.64 has square roots {0.8, -0.8}.