Question 963738
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Sqrt of -15 times the sqrt of -5
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The "solution" in the post by @lwsshak3 is incorrect and makes no sense.


A correct answer is as follows:


        - in real numbers, {{{sqrt(-15)}}} and {{{sqrt(-5)}}} are not defined, so it makes no sense (prohibited) to manipulate with them.


        - in complex numbers, square root always has two values for a non-zero argument.


So, when somebody asks what is {{{sqrt(-15)*sqrt(-5)}}}, he/she should determine/define first, 
which of two possible values for each {{{sqrt(-15)}}} and {{{sqrt(-5)}}} does he/she means.


Only after that the answer can be done.