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Find the slope of the function's graph at the \( g \) \( f(x)=x^{2}+1,(-5,26) \) What is the slope of the function's graph at th \( m=-10 \) (Simplify your answer.) Find an equation for the line tangent to the gi \( y=\square \)

Ask by Hill Hodgson. in the United States
Mar 09,2025

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Answer

The slope of the function's graph at \((-5,26)\) is \( m = -10 \). The equation of the tangent line at this point is \( y = -10x - 24 \).

Solution

**Step 1. Differentiate the Function** We are given the function \[ f(x)=x^2+1 \] Differentiate \( f(x) \) with respect to \( x \) to find the slope function: \[ f'(x)=\frac{d}{dx}(x^2+1)=2x \] **Step 2. Find the Slope at the Given Point** The point provided is \((-5,26)\). Substitute \( x=-5 \) into \( f'(x) \): \[ f'(-5)=2(-5)=-10 \] Thus, the slope of the function's graph at \((-5,26)\) is \[ m=-10 \] **Step 3. Find the Equation of the Tangent Line** The tangent line at a point \((a, f(a))\) with slope \( m \) has the point-slope form: \[ y - f(a) = m (x - a) \] For our function at \( a = -5 \) with \( f(-5)=26 \) and \( m=-10 \), the equation becomes: \[ y - 26 = -10 (x - (-5)) \] Simplify the equation: \[ y - 26 = -10 (x+5) \] Expand right-hand side: \[ y - 26 = -10x - 50 \] Solve for \( y \): \[ y = -10x - 50 + 26 \] \[ y = -10x - 24 \] Thus, the equation of the tangent line to the graph of \( f(x)=x^2+1 \) at \((-5,26)\) is: \[ y=-10x-24 \]

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To find the slope of the function \( f(x) = x^2 + 1 \) at the point \( (-5, 26) \), we first need to calculate the derivative \( f'(x) \). The derivative is given by \( f'(x) = 2x \). Now, plug in \( x = -5 \) into the derivative to get the slope: \[ f'(-5) = 2(-5) = -10. \] So, the slope of the tangent line at that point is \( -10 \). Now, to find the equation of the tangent line, we can use the point-slope form of the equation of a line, which is \( y - y_1 = m(x - x_1) \). Here, \( m = -10 \), \( x_1 = -5 \), and \( y_1 = 26 \): \[ y - 26 = -10(x + 5). \] Simplifying this yields: \[ y - 26 = -10x - 50 \implies y = -10x - 24. \] Thus, the equation of the tangent line is \( y = -10x - 24 \). Fun Fact: Slope in calculus isn’t just a number—it’s a representation of how fast something is changing! When a car travels on a hilly road, the slope indicates whether it’s climbing up a hill or racing down one! Practical Tip: When finding the equation of a tangent line, always remember to use the point-slope form right after calculating the slope. It’s a straightforward method that saves you from making any calculation errors!

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