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Question

For all x±12, simplify 6x2x24x21.

A
23x2x+1
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B
3x+22x+1
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C
3x+22x1
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D
3x22x+1
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E
3x22x1
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Solution

The correct option is E 3x22x1
The value of 6x2x24x21, for x±12 is
=6x24x+3x2(2x)212
=2x(3x2)+1(3x2)(2x1)(2x+1)
=(3x2)(2x+1)(2x1)(2x+1)
=3x22x1

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