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Chapter 1

Section 4

Extra Example 1

 

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Press <ENTER>.

 

The calculator places an arrow at the x-value we chose and now asks for a point on the graph whose x-coordinate is to the right of the x-intercept's x-coordinate.  We can do this by moving the cursor with the arrow keys or by typing in an x-value.  We'll do it the second way.  Note that the graph crosses the x-axis near the point (3, 0) so we'll choose 4.  Simply type "4."

 

 

Press <ENTER>.

 

 

The calculator now asks for a "Guess."  That simply means that we should move the cursor close to the x-intercept.  The more complicated the function, the more important it is to get the cursor very close to the x-intercept.

 

 

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Our answer is x = 3.

 

 

 

 

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