You can take out the perfect square 4:
root(40) = root(4 x 10) = root(4) x root(10) = 2 root(10).
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The square root of 40 is about 6.32
The square root of negative 40 is: 6.324555 i
The square root of 40 is an irrational number
6.322=40
Rounded to two decimal places, the square root of 40 is equal to ±6.32.6.32455532