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Question

limx128x3+12x+1

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Solution

limx128x3+12x+1

=82limx12x3+(12)3x+12

=4limx12x3(12)3x(12)

Applying formula limxaxnanxa=nan1

Here, n=3, a=12

=4limx12x3(12)3(12)=4×3(12)31

=4×3×14=3


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