User guide

to complete using the calculator. This topic will not be covered in the scope
of this manual but see your instructor for help with this feature.
4 Storing
4.1 Storing a solution value
You can use the store feature of the calculator to rename a letter or variable
as a specific value. This is especially helpful when a value is complex or
contains non-terminating digits.
Example 6. Given the equation 0.4x = 0.2(0.6x) − 4 we solve for x to
find a solution as x = −
100
7
. Upon approximating u this solution as a
decimal we have x ≈ −14.285 . . .. If we were to check our solution by plugging
the approximate solution x ≈ −14.285 . . . into the original equation, our
solution would only check approximately. Instead we can store the exact value
x = −
100
7
and expect our solution to check exactly. To store the value −
100
7
into x we can retype our solution in the next line or you may use the button
marked D for the most recent answer. The correct format to store a value
into a variable is always value FIRST then W, chosen italic variable then
E button.
If I choose the variable x it will remain the value −
100
7
until otherwise
stored or cleared. To check our solution we wish to show that the left hand
side is equal to the right hand side.
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