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Question

limx(x2+5x+3x2+x+3)x=

A
e4
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B
e2
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C
e3
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D
0
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Solution

The correct option is B e4
limx(x2+5x+3x2+x+3)x (1form)
=elimx(x2+5x+3x2+x+31)x
=elimx(x2+5x+3x2x3x2+x+3)x
=elimx(4x2x2+x+3)
=elimx⎜ ⎜ ⎜41+1x+3x2⎟ ⎟ ⎟
=e4

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