Trial and error. You know that the answer will be between 2 and 3, closer to 3.
2.8 squared = 7.84
2.82 squared = 7.95
2.828 squared = 7.99
2.8284 squared = 7.999 which is close enough for me.
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The square root of minus 8 is equal to the square root of 8 times the square root of minus 1, or 2.8284i.
Square Root of 50: 7.0710678118654752440084436210485Square Root of 8: 2.82842712474619009760337744841942.8284271247461900976033774484194+7.0710678118654752440084436210485-------------------------------------------------------------9.8994949366116653416118210694674
The square root of 8 is 2 multiplied by the square root of 2
The square root of 64 is 8
4 square root of 7