How do you find the principal square root of -121?

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How do you find the principal square root of -121?

2006-10-26 14:20:30 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

4 answers

11i

2006-10-26 14:25:46 · answer #1 · answered by Nobody 3 · 0⤊ 0⤋

You can't take the square root of a negative number. You simply put an i (imaginary) beside it making it positive. Include the i in your answer as well.

2006-10-26 21:40:17 · answer #2 · answered by Dink 4 · 0⤊ 0⤋

sqrt(-121) = sqrt(121 * -1) = sqrt(121) * sqrt(-1)

sqrt(-1) = i
sqrt(121) = +11 or -11

so

ANS : 11i or -11i

2006-10-26 23:22:41 · answer #3 · answered by Sherman81 6 · 0⤊ 0⤋

There is no natural (real?) number that can be squeared to give -121.

2006-10-26 21:28:03 · answer #4 · answered by dryheatdave 6 · 0⤊ 0⤋