Question: how to calculate the square root of a negative number in excel?
Answer: First, to square a number, multiply the number by itself. ...  The square root of 16 is 4. Instead of using the SQRT function, you could also use an exponent of 1/2. ...  If a number is negative, the SQRT function returns the #NUM! ...  You can use the ABS function to remove the minus sign (-) from a negative number.