x5 / x2 = x3.
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3 x 10 to the 5th power + 3 x 10 to the 4th power + 2 x 10 to the 2nd power
Not a great deal. Multiply it by itself and divide by 4. If x is imaginary, x2 is negative.
36
3 to the 2nd power times 3 to the 5th power = 3x3 x 3x3x3x3x3 = 2187
X to the 2nd power is simply X squared, or X times X.