Exponents are a shorthand way to show how many times a number, called the base, is multiplied to itself. A number with an exponent is said to be "raised to the power" of that exponent.
Two raised to the power of three = 23 = 2 × 2 × 2 = 8
Any number raised to the power of one equals itself, for example:
151 = 15
Any number (except 0) raised to the zero power equals 1, for example:
A negative exponent means that the base is changed to its reciprocal and then raised to the power of the positive exponent, for example:
The following video show more examples of negative exponents:
54 x 5-3 = 54-3 = 5
A fractional exponent in the form of means to take the nth root of the base, for example:
is the square root of 4.
The following video show more examples of fractional exponents:
If two numbers with exponents have the same base, you can multiply them by adding the exponents, for example:
4510 × 4531 = 4541
When you have a power of a power, you multiply the exponents, for example:
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