Some scientific calculators can't handle complex or imaginary numbers. If you happen to have a special calculator that does, probably the manual will tell you how to enter them.
The HP 48 and up series does. It depends on if your calculator is in Polar Coordinate mode or X-Y coordinate mode, but a quick way to get the imaginary number i (regardless of which mode the calculator is currently in), is to press -1, then 'square root' button.
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to disable the drives go to run and type regedit and press enter after press enter
if you are using an algebra calculator you press, 2nd, +, 7, 1, 2 enter
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You can enter complex fractions on a TI-Inspire calculator, even though there is not a fraction button. Since a fraction bar essentially means to divide, so the division button is a fraction bar.