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# FP2 complex nunbers q watch

1. Am I allowed to do the sign changing with mods? Like this... the thing I did at the end.
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2. (Original post by cooldudeman)
Am I allowed to do the sign changing with mods? Like this... the thing I did at the end.
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Absolutely. IF you envisage an argand diagram and a point (a,b) that represents a particular complex number, the magnitutde of z represents the length from the point to the origin (sqrt[x^2+y^2]). If you were to multiply it by -1, it would just be in the opposite direction and hence still the same length.
3. (Original post by hecandothatfromran)
Absolutely. IF you envisage an argand diagram and a point (a,b) that represents a particular complex number, the magnitutde of z represents the length from the point to the origin (sqrt[x^2+y^2]). If you were to multiply it by -1, it would just be in the opposite direction and hence still the same length.
Thanks thats good to know

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