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Exponents and Logarithms

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Power Rule for Exponents

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When multiplying two powers that have the same base, you can add the exponents: anam=an+ma^n \cdot a^m = a^{n+m}.

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Quotient Rule for Exponents

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When dividing two powers with the same base, subtract the exponents: anam=anm\frac{a^n}{a^m} = a^{n-m} where a0a\neq0.

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Zero Exponent Rule

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Any nonzero number raised to the power of zero equals one: a0=1a^0 = 1 where a0a\neq0.

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Negative Exponent Rule

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A negative exponent represents the reciprocal of the number raised to the opposite positive exponent: an=1ana^{-n} = \frac{1}{a^n} where a0a\neq0.

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Power of a Product Rule

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A product raised to an exponent means each factor is raised to the exponent: (ab)n=anbn(ab)^n = a^n \cdot b^n.

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Power of a Quotient Rule

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A quotient raised to an exponent means both numerator and denominator are raised to the exponent: (ab)n=anbn\left(\frac{a}{b}\right)^n = \frac{a^n}{b^n} where b0b\neq0.

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Power of a Power Rule

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When raising a power to a power, multiply the exponents: (an)m=anm(a^n)^m = a^{n \cdot m}.

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Product to Power for Exponents

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Multiple powers with different bases raised to the same power can be simplified: (ab)n=anbn(a\cdot b)^n = a^n \cdot b^n.

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Change of Base Formula for Logarithms

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The logarithm of a number with one base can be converted to a logarithm with a different base: logba=logcalogcb\log_b a = \frac{\log_c a}{\log_c b}.

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Product Rule for Logarithms

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The logarithm of a product is the sum of the logarithms of the factors: logb(ac)=logb(a)+logb(c)\log_b(a \cdot c) = \log_b(a) + \log_b(c).

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Quotient Rule for Logarithms

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The logarithm of a quotient is the difference of the logarithms of the numerator and the denominator: logb(ac)=logb(a)logb(c)\log_b\left(\frac{a}{c}\right) = \log_b(a) - \log_b(c).

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Power Rule for Logarithms

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The logarithm of a number raised to an exponent is the exponent times the logarithm of the number: logb(an)=nlogb(a)\log_b(a^n) = n \cdot \log_b(a).

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Natural Logarithm

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The natural logarithm, denoted as ln\ln, is the logarithm to the base ee, where ee is the Euler's number approximately 2.71828: ln(x)=loge(x)\ln(x) = \log_e(x).

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Logarithm of One

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The logarithm of one, regardless of the base, is always zero: logb(1)=0\log_b(1) = 0.

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Logarithm of the Base

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The logarithm of the base to itself is always one: logb(b)=1\log_b(b) = 1.

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Inverse Properties of Logarithms and Exponents

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Exponential and logarithmic functions are inverses of each other: blogb(a)=ab^{\log_b(a)} = a and logb(ba)=a\log_b(b^a) = a.

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Common Logarithm

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The common logarithm is the logarithm with base 10, often denoted as log\log: log(x)=log10(x)\log(x) = \log_{10}(x).

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Continuous Compound Interest

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The formula for continuous compound interest is A=PertA = Pe^{rt} where PP is the principal amount, rr is the annual interest rate, tt is time in years, and AA is the amount on the account after tt years.

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