SOLUTION: The question is : For i = the square root of -1, if 3i (2 + 5i) = x + 6i, then x = ? I came up with x = 15, however, the test answer says x = -15. I am confused...how can you

Question 377975: The question is :
For i = the square root of -1, if 3i (2 + 5i) = x + 6i, then x = ?
I came up with x = 15, however, the test answer says x = -15. I am confused...how can you get the square root of a negative # and it be a negative #?
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
simplifies to or --> x = -15.
The square root of a negative number is not defined on the real axis. This is why mathematicians created the number . For example, .
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