a. Find the derivative function f for the function f. b. Find an equation of the line tangent to the graph of f at (a,f(a)) for the given value of a. f(x) = 2x - 9x + 10, a = 2 a. f'(x) = |4x- 9 b. y =D

Algebra & Trigonometry with Analytic Geometry
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Author:Swokowski
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Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.3: The Natural Exponential Function
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### Calculus Problem: Finding Derivatives and Tangent Lines

#### Problem Statement:

a. Find the derivative function f' for the function f.

b. Find an equation of the line tangent to the graph of f at (a, f(a)) for the given value of a.

#### Given Function and Value:
\[ f(x) = 2x^2 - 9x + 10 \]
\[ a = 2 \]

#### Solutions:

**a. Derivative Function f'**

\[ f'(x) = 4x - 9 \]

**b. Tangent Line Equation**

To find the equation of the tangent line, we substitute \( a = 2 \) into the derivative function to find the slope at that point. Then, we find the y-coordinate by substituting \( x = 2 \) into the original function.

The tangent line equation will be in the form:

\[ y = mx + c \]

Where \( m \) is the slope and \( c \) is the y-intercept.

**Steps to Find the Tangent Line:**
1. **Slope of the Tangent Line:** 
    Substitute \( a = 2 \) into the derivative function to get the slope \( m \):
    \[ f'(2) = 4(2) - 9 = 8 - 9 = -1 \]

2. **Point on the Graph:** 
    Substitute \( x = 2 \) into the original function to get the y-coordinate \( f(2) \):
    \[ f(2) = 2(2)^2 - 9(2) + 10 = 2(4) - 18 + 10 = 8 - 18 + 10 = 0 \]

3. **Equation of the Tangent Line:** 
    Using the slope \( m \) and the point (2, 0):
    \[ y = -1(x - 2) + 0 \]
    Which simplifies to:
    \[ y = -x + 2 \]

Thus, the equation of the tangent line is:
\[ y = -x + 2 \]
Transcribed Image Text:### Calculus Problem: Finding Derivatives and Tangent Lines #### Problem Statement: a. Find the derivative function f' for the function f. b. Find an equation of the line tangent to the graph of f at (a, f(a)) for the given value of a. #### Given Function and Value: \[ f(x) = 2x^2 - 9x + 10 \] \[ a = 2 \] #### Solutions: **a. Derivative Function f'** \[ f'(x) = 4x - 9 \] **b. Tangent Line Equation** To find the equation of the tangent line, we substitute \( a = 2 \) into the derivative function to find the slope at that point. Then, we find the y-coordinate by substituting \( x = 2 \) into the original function. The tangent line equation will be in the form: \[ y = mx + c \] Where \( m \) is the slope and \( c \) is the y-intercept. **Steps to Find the Tangent Line:** 1. **Slope of the Tangent Line:** Substitute \( a = 2 \) into the derivative function to get the slope \( m \): \[ f'(2) = 4(2) - 9 = 8 - 9 = -1 \] 2. **Point on the Graph:** Substitute \( x = 2 \) into the original function to get the y-coordinate \( f(2) \): \[ f(2) = 2(2)^2 - 9(2) + 10 = 2(4) - 18 + 10 = 8 - 18 + 10 = 0 \] 3. **Equation of the Tangent Line:** Using the slope \( m \) and the point (2, 0): \[ y = -1(x - 2) + 0 \] Which simplifies to: \[ y = -x + 2 \] Thus, the equation of the tangent line is: \[ y = -x + 2 \]
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ISBN:
9781133382119
Author:
Swokowski
Publisher:
Cengage