Equation of Tangent Line Parallel to x+2y-6=0 for f(x)=x^2-x

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Homework Help Overview

The problem involves finding the equation of a tangent line to the function f(x) = x^2 - x that is parallel to the line given by the equation x + 2y - 6 = 0.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the requirement for parallel lines and the need to express the given line in slope-intercept form. There is an exploration of the derivative of the function to find the slope of the tangent line.

Discussion Status

Some participants have provided guidance on simplifying the line equation and taking the derivative of the function. There is an ongoing exploration of the relationship between the slopes of the lines, with some questioning the initial assumptions about their relationship.

Contextual Notes

There appears to be confusion regarding the slopes of the lines, with one participant noting that the slopes are perpendicular rather than parallel, suggesting a need for further clarification on the problem's requirements.

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Homework Statement



Function: f(x)=x^2-x Line: x+2y-6=0


The Attempt at a Solution


Find an equation of the line that is tangent to the graph of f and parallel to the given line.
 
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What is the requirement for two lines to be parallel to each other?
 
First, you must simplify your line for y = mx + b form.

x + 2y - 6 = 0

-> x - 6 = -2y

-> [tex]\frac{x-6}{-2}[/tex] = y

-> y = [tex]\frac{-1x}{2}[/tex] + 3

Next, to find a line tangent to f(x), we take it's derivative

f'(x) = 2x - 1

Compare the two slopes. 2 and -1/2. These are in fact perpendicular to each other. See what you can do with that.
 
RPierre said:
First, you must simplify your line for y = mx + b form.

x + 2y - 6 = 0

-> x - 6 = -2y

-> [tex]\frac{x-6}{-2}[/tex] = y

-> y = [tex]\frac{-1x}{2}[/tex] + 3

Next, to find a line tangent to f(x), we take it's derivative

f'(x) = 2x - 1

Compare the two slopes. 2 and -1/2. These are in fact perpendicular to each other. See what you can do with that.

I think you should rethink that. I see a line with slope -1/2 and another line with a variable slope. Perhaps you should equate them.
 
thanks guys
 

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