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the number e is by definition the number which raised to x will produce a graph such that at every point on the graph the slope of the graph is equal to x.

In otherwords, the answer to your question is because that is the way e is defined.

IDK... I saw e^x defined as a power series.

Consider: Let y = e^x

Since x is real (by assumption) then

ln(y) = x, where ln(t) is the natural logarithm of t. Now differentiate with respect to x

1/y * (dy/dx) = 1 Multiplying both sides by y, we get

dy/dx = y = e^x. This fits with the first definition but is more rigorous.

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15y ago

What else can I help you with?