When evaluating rational expressions we can plug in the
appropriate values either before
we simplify or after , the result will be the same. Although, it is more
efficient to simplify
first then evaluate.
A. Simplify and state the restrictions to the domain.
Even if the factor cancels it still contributes to the
list of restrictions. Basically, it is
important to remember the domain of the original expression when simplifying.
must use caution when simplifying, please do not try to take
obviously incorrect short cuts like this :
equal zero so there
are no real restrictions
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