Powers of the imaginary unit (video) | Khan Academy
https://www.khanacademy.org/.../calculating-i-raised-to-arbitrary...
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And this is the same thing, just from our exponent properties, as i to the fourth power raised to the 25th power ... Exponents with negative bases (video) | Khan Academy
https://www.khanacademy.org/...seventh...exponents.../exponents...
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A negative number raised to an even exponent will always give you a positive number. A negative number ... Even, Odd and Fractional Exponents. - Brody Acquilano | Brilliant
https://brilliant.org/discussions/thread/even-odd-and-fractional-exponents/
If the exponentb is a fraction it results in a radical or "root". Even roots such as the square root will always be positive. ... Odd roots can be negative or positive. The cube root of a negative number will be a negative number, and the cube root a positive number will be positive. Calculate any Power of i (the Square Root of -1) - WebMath
www.webmath.com/cn_i.html
Calculate any Power of i (the Square Root of -1) - powered by WebMath. 
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