Checking Factoring on the TI-83 calculator - Cedar Valley College
Checking Factoring on the TI-83 calculator - Cedar Valley College
Checking Factoring on the TI-83 calculator - Cedar Valley College
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Tutoring Center 972-860-2974Room C209<str<strong>on</strong>g>Checking</str<strong>on</strong>g> <str<strong>on</strong>g>Factoring</str<strong>on</strong>g> <strong>on</strong> <strong>the</strong> <strong>TI</strong>-<strong>83</strong> <strong>calculator</strong>Check Method 1: Check factors/answer <strong>on</strong> <strong>the</strong> home screen in equati<strong>on</strong> form.Factor x 2 - 12x + 36. OR Find (x - 6) 2 .• Choose your “favorite” positive <strong>on</strong>e-digit (for ease)integer value and store <strong>the</strong> value in x (do not pick 0 or 1).For example, to store a 7: 7 STO► x• Hit ENTER.• Enter <strong>the</strong> problem to be factored (or multiplied) and set"=" to <strong>on</strong>e of <strong>the</strong> possible answers (or <strong>the</strong> answer youwant to check). The "=" sign is under 2nd MATH(TEST) #1 =.• Hit ENTER.• If a 0 appears, this is NOT <strong>the</strong> correct answer.If a 1 appears, this IS <strong>the</strong> correct answer.Check Method 2: Check factors/answer by graphing.Factor x 2 - 12x + 36. OR Find (x - 6) 2 .• Enter <strong>the</strong> expressi<strong>on</strong> into <strong>the</strong> Y1= <strong>on</strong> <strong>the</strong> <strong>calculator</strong>.• Enter <strong>the</strong> possible answer resp<strong>on</strong>se into Y2=.• Move to <strong>the</strong> left of <strong>the</strong> Y2= and choose <strong>the</strong> open circle. This setting will allow you toclearly see <strong>the</strong> animated circle crossing <strong>the</strong> screen.• When <strong>the</strong> answer is correct, <strong>the</strong> animated circle will be "riding" <strong>on</strong> top of <strong>the</strong> originalgraph.• Keep checking until <strong>the</strong> correct answer is found.• The <strong>on</strong>ly difficult feature of this method is <strong>the</strong> occasi<strong>on</strong>al need to adjust <strong>the</strong> viewingwindow to see <strong>the</strong> graph.
The animated bubble does not run al<strong>on</strong>g <strong>the</strong>original curve. It forms its own graph.This is not <strong>the</strong> correct soluti<strong>on</strong>.The animated bubble runs al<strong>on</strong>g <strong>the</strong>original graph. This is <strong>the</strong> answerUpdated 2-16-09