For what value(s) of x is the line tangent to the curve y = xV6 - x horizontal? Vertical?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter9: Real Numbers And Right Triangles
Section9.7: The Tangent Ration
Problem 14E
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For what value(s) of x is the line tangent to the curve
y = xV6 - x horizontal? Vertical?
Transcribed Image Text:For what value(s) of x is the line tangent to the curve y = xV6 - x horizontal? Vertical?
Expert Solution
Step 1

Given curve is:

y=x6-x

Differentiating with respect to x we get,

dydx=6-x-x26-xdydx=26-x-x26-xdydx=12-2x-x26-xdydx=12-3x26-x

This is the slope of the tangent line to the given curve.

Step 2

The tangent line becomes horizontal when:

dydx=0

That is when:

12-3x26-x=012-3x=03x=12x=123x=4

Hence the answer.

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