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any number (integer or real, positive or negative) can be expressed in exponential form. Exponent form relates multiplication

examples:

4=2^2 (alternate notation 2**2) indicating that 4= 2 x 2

2^2.5 expresses 5.656854249492380195206754897....

(-2)^3=-8 in other words (-2) x (-2) x (-2)

(-2.1)^3= -9.260999... (repeating decimal) [ Even complex numbers can be used in exponentiation (x+yi) ]

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Q: What is a number that can be expressed using an exponent?
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