sqrt(42)=sqrt(2*3*7)
These are all prime numbers,
so sqrt(42) cannot be 'simplified' as for example sqrt(8)=2*sqrt(2)
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The square root of 20 is simplified as: ± 4.5
The square root of 212 simplified is: 14.6
The square root of 13 simplified is 3.6
The square root of 176 simplified is 13.3
The simplified square root of 530,000 is: ± 728