§ 4.2 The Exponential Function e x.

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Presentation transcript:

§ 4.2 The Exponential Function e x

Section Outline e The Derivatives of 2x, bx, and ex

The Number e Definition Example e: An irrational number, approximately equal to 2.718281828, such that the function f (x) = bx has a slope of 1, at x = 0, when b = e

The Derivative of 2x

Solving Exponential Equations EXAMPLE Calculate. SOLUTION

The Derivatives of bx and ex

Solving Exponential Equations EXAMPLE Find the equation of the tangent line to the curve at (0, 1). SOLUTION We must first find the derivative function and then find the value of the derivative at (0, 1). Then we can use the point-slope form of a line to find the desired tangent line equation. This is the given function. Differentiate. Use the quotient rule.

Solving Exponential Equations CONTINUED Simplify. Factor. Simplify the numerator. Now we evaluate the derivative at x = 0.

Solving Exponential Equations CONTINUED Now we know a point on the tangent line, (0, 1), and the slope of that line, -1. We will now use the point-slope form of a line to determine the equation of the desired tangent line. This is the point-slope form of a line. (x1, y1) = (0, 1) and m = -1. Simplify.