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I've been doing this online math bridging course from a German uni to which I am planning to go soon, it is going through all high school maths from the beginning(it has been a while since I did it).
The chapter on roots so far ignores complex numbers, which will be introduced in a later chapter... but they claim that [itex]\sqrt[3]{-125}[/itex] = -5 ! Can this be correct? Surely not?
I always thought that any root of a negative number has only complex solutions (I know that positive ones have complex and real solutions)
What is [itex]\sqrt[3]{-1}[/itex] anyway? (I am having a bit of a brain-freeze at the moment.)
Thank you!
The chapter on roots so far ignores complex numbers, which will be introduced in a later chapter... but they claim that [itex]\sqrt[3]{-125}[/itex] = -5 ! Can this be correct? Surely not?
I always thought that any root of a negative number has only complex solutions (I know that positive ones have complex and real solutions)
What is [itex]\sqrt[3]{-1}[/itex] anyway? (I am having a bit of a brain-freeze at the moment.)
Thank you!