Apps. and Interpretation for IBDP Maths Ebook 1 | Page 9

Front Page
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