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Exponents and Logarithms
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Power Rule for Exponents
When multiplying two powers that have the same base, you can add the exponents: .
Quotient Rule for Exponents
When dividing two powers with the same base, subtract the exponents: where .
Zero Exponent Rule
Any nonzero number raised to the power of zero equals one: where .
Negative Exponent Rule
A negative exponent represents the reciprocal of the number raised to the opposite positive exponent: where .
Power of a Product Rule
A product raised to an exponent means each factor is raised to the exponent: .
Power of a Quotient Rule
A quotient raised to an exponent means both numerator and denominator are raised to the exponent: where .
Power of a Power Rule
When raising a power to a power, multiply the exponents: .
Product to Power for Exponents
Multiple powers with different bases raised to the same power can be simplified: .
Change of Base Formula for Logarithms
The logarithm of a number with one base can be converted to a logarithm with a different base: .
Product Rule for Logarithms
The logarithm of a product is the sum of the logarithms of the factors: .
Quotient Rule for Logarithms
The logarithm of a quotient is the difference of the logarithms of the numerator and the denominator: .
Power Rule for Logarithms
The logarithm of a number raised to an exponent is the exponent times the logarithm of the number: .
Natural Logarithm
The natural logarithm, denoted as , is the logarithm to the base , where is the Euler's number approximately 2.71828: .
Logarithm of One
The logarithm of one, regardless of the base, is always zero: .
Logarithm of the Base
The logarithm of the base to itself is always one: .
Inverse Properties of Logarithms and Exponents
Exponential and logarithmic functions are inverses of each other: and .
Common Logarithm
The common logarithm is the logarithm with base 10, often denoted as : .
Continuous Compound Interest
The formula for continuous compound interest is where is the principal amount, is the annual interest rate, is time in years, and is the amount on the account after years.
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