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Question

Find the GCD of the following 24(6x4−x3−2x2),20(2x6+3x5+x4)

A
4x2(2x+1)
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B
2x2(2x+1)
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C
4x2(2x1)
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D
None of these
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Solution

The correct option is C 4x2(2x+1)
Now,
24(6x4x32x2)=24x2(6x2x2)=24x2(6x24x+3x2)=64x2(3x2)(2x+1)......(1).
And,
20(2x6+3x5+x4)
=20x4(2x2+3x+1)
=20x4(2x+1)(x+1).....(2).
We've gcd of 24 and 20 is 4.
Then gcd of 24(6x4x32x2),20(2x6+3x5+x4) is 4x2(2x+1).

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