+12 and -12
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The square root of 144 is 12 12
The subsets of all the square roots of 144 are {+12} and {-12}. The single set that includes all the square roots of 144 is {+12, -12}. That's all there are. There are no more.
No. 144 has exatly two square roots. +12 and -12 are them.No other number can be one.72 can be half of 144, and in fact, it is.
They are called perfect squares.
72