Asked by Adam
lim 81-x/9-square root of x
X->81
Answers
Answered by
Reiny
rationalize the denominator by multiplying top and bottom by 9 + √x to get
lim (81-x)(9+√x)/[(9-√x + √x)]
= lim 9+√x , as x ---> 81
= 18
lim (81-x)(9+√x)/[(9-√x + √x)]
= lim 9+√x , as x ---> 81
= 18
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