What Values of K Make the Intersection of Two Graphs Positive?

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Homework Help Overview

The discussion revolves around finding the values of 'k' for which the line represented by the equation y = kx + 3 intersects the parabola given by y = x^2 + 8x at two distinct points. Participants are exploring the conditions under which this intersection occurs.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss setting the equations equal to each other to find points of intersection and express concerns about how to isolate 'x' in terms of 'k'. There are inquiries about the discriminant of the resulting quadratic equation and its implications for the number of solutions. Some participants seek clarification on the meaning of the discriminant being positive and how it relates to the values of 'k'.

Discussion Status

The conversation is active, with various participants attempting to clarify the relationship between the discriminant and the conditions for distinct intersections. Some guidance has been provided regarding the use of the discriminant and its role in determining the nature of the roots of the quadratic equation. However, there is no explicit consensus on the final values of 'k' that satisfy the conditions discussed.

Contextual Notes

Participants are grappling with the implications of the discriminant being negative and the properties of quadratic equations. There is an emphasis on understanding the underlying concepts rather than merely performing algebraic manipulations.

  • #31
Try completing the square: x^2- 16k+ 76= (x- ?)^2+ ?. Now, what values of k make that positive?
 
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  • #32
HallsofIvy said:
Try completing the square: x^2- 16k+ 76= (x- ?)^2+ ?. Now, what values of k make that positive?
Been there and done that. See post #27.
 

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