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How can we use the graphing calculator to find points of intersection?

LESSON

FINDING ZEROS

Graph Function

Common Error

ZEROS

2nd -> Trace -> 2: zero

Left Bound? x = -4

Right Bound? x = -2

Check Window Settings.

Any x value typed in must be seen in window.

(-3,0)

Guess!

INTERSECTION

Graph Both Functions

(2.305, 3.729)

INTERSECTIONS

2nd -> Trace -> 5: intersect

First curve?

  • Move cursor close to point of intersection

Second Curve? Press Enter

Guess!

SUPERIMPOSED EQUATIONS

SUPERIMPOSED EQUATIONS

SUPERIMPOSED GRAPHS

Set equations equal to each other

Set equation equal to zero

METHOD

Graph and find zero

(-1.86, 0)

(0.719, 0)

(-0.507, 0)

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