Define:
natural logarithm
natural logarithm function
logarithmic equation
exponential equation

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Natural logarithm is a logarithm to the base e (2.71828…).

natural logarithm function After understanding the exponential function, our next target is the natural logarithm. Given how the natural log is described in math books, there's little “natural” about it: it's definedas the inverse of e^x, a strange enough exponent already.

logarithm equation is Solving Logarithmic Equationsfrom the Definition. The first type of logarithmic equation has two logs, each having the same base, set equal to each other, and you solve by setting the insides (the "arguments") equal to each other. For example: Solve log2(x) =log2(14).

Exponential Equation To solve an exponential equation, take the log of both sides, and solve for the variable. Example 1: Solve for x in the equation . Solution: Step 1: Take the natural log of both sides: ... Ln(80) is the exact answer and x=4.38202663467 is an approximate answer

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