Question 652351: square root of -15 multiplied by square root of -3 divided by square root of 5
Found 2 solutions by Shana-D77, MathTherapy:
Answer by Shana-D77(132)   (Show Source):
You can put this solution on YOUR website! square root of a negative, as you know, is not real. BUT, if you multiply a negative square root by another negative square root, you get a positive! So,
(sqrt -15)(sqrt -3) = sqrt 45
sqrt 45 simplifies to sqrt 9 * sqrt 5
sqrt 9 = 3 so,
sqrt 45 = 3 sqrt 5
(3 sqrt 5)/(sqrt 5) = 3
Answer = 3
Answer by MathTherapy(10801)  (Show Source):
You can put this solution on YOUR website!
square root of -15 multiplied by square root of -3 divided by square root of 5
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x = 5 or - 4, as stated by the other person, is WRONG!
The statement by the other person, ".....BUT, if you multiply a negative square root by another
negative square root, you get a positive!", is DEAD WRONG! As a result, his/her answer, 3, is WRONG!
 ----- Applying  , 
 ---- Changing  to i
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