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GDC Skills
Some implicit skills of TI-84 Plus CE that you might not heard before Scenario 1 : Solving f ( x) � g( x) in Functions
Step 1 : Set f ( x) �g( x) � 0 Step 2 : Input Y
1
� f ( x) � g( x) in the graph function Step 3 : Set the screen size from window
�
� x min and x max : You can refer to the domain given in the question y min and y max : You can set y min �� 1 and y max � 1 if you wish to find the x -intercept only
Scenario 2 : Finding the number of years , n , when f ( x) � g( x) is in the exponent of an exponential model , in Arithmetic Sequences / Geometric Sequences / Logarithmic Functions
Step 1 : Set the right-hand-side of the expression to be zero Step 2 : Input Y1
� the left-hand-side of the expression in the graph function Step 3 : Set the screen size from window
� x min : You can set xmin � 0 as n represents the number of years which must be a positive integer
Scenario 3 : Finding the x -intercept from the window
� Assume that the domain is 0 �x
� 100 , and it is clearly shown that the curve cuts the x -axis once only on the left part of the screen
� You can set the left bound and the right bound to be 0 and 50 respectively to find the x -intercept efficiently , as 50 is the midpoint of the x -axis