On 22/03/12 12:17, Sarah Goslee wrote:
It's order of operations, and a good reason to always use
parentheses: which is evaluated first, the unary minus or
the raising-to-powers?
(-4)^0.5
-(4^0.5)
sqrt(-4)
-sqrt(4)
If the OP *really* wants the square root of -4 he could do
sqrt(-4+0i) or (-4+0i)^0.5 (and get 0+2i in either case).
cheers,
Rolf Turner
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