I don't understand how to simplify after multiplying the numerator and denominator by the conjugate.
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That is the beauty of multiplying by the conjugate, the cross terms always cancel out. .
In this case you have
Where and . So
ok, so now how do I go from
Originally Posted by Mike9182 ok, so now how do I go from
Cancel the and move the 5 to the denominator, also go ahead and factor out a from that fraction
Now take the limit as and that term goes away and you get
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