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Question

If x=21/3−2−(1/3), then 2x3+6x is equal to

A
0
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B
3
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C
3/2
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D
6
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Solution

The correct option is B 3
x3=[21/22(1/3)]3=[2(1/3)]3[2(1/3)]33(21/3)[2(1/3)][21/32(1/3)]
=2123x
or x3+3x=412=32
or 2x2+6x=3

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