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# Casio "i" in answer watch

1. Does anyone know what the 'i' is in the answer displayed by some Casio calculators?

The answer to one question I'm doing is 52.5+25.69857324i, does anyone know how to convert that to a decimal? I remember going over it when I did A Level maths, but that was many years ago now.

Cheers (Y)
2. (Original post by neil_s)
Does anyone know what the 'i' is in the answer displayed by some Casio calculators?

The answer to one question I'm doing is 52.5+25.69857324i, does anyone know how to convert that to a decimal? I remember going over it when I did A Level maths, but that was many years ago now.

Cheers (Y)
i is presumably the square root of -1 in this instance. You clearly have an equation with no real roots or at least one none real.
3. Sounds about right to be fair, it was for a solution to a quadratic lagrangian, it's been seven pages of algebra so far. All good fun!
4. (Original post by neil_s)
it's been seven pages of algebra so far.
fuarrk
5. (Original post by neil_s)
The answer to one question I'm doing is 52.5+25.69857324i, does anyone know how to convert that to a decimal?
It is a decimal!

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Updated: December 30, 2012
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