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Question

Find the GCD of the following x2x2,x2+x6,3x213x+14

A
x2
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B
x+2
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C
x3
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D
None of these
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Solution

The correct option is A x2
We first factorize the given polynomials x2x2,x2+x6 and 3x213x+14 as shown below:

x2x2=x22x+x2=x(x2)+1(x2)=(x2)(x+1)

x2+x6=x2+3x2x6=x(x+3)2(x+3)=(x2)(x+3)

3x213x+14=3x26x7x+14=3x(x2)7(x2)=(x2)(3x7)

The common factor of x2x2,x2+x6 and 3x213x+14 is (x2), therefore, the GCD is x2.

Hence, the greatest common divisor is x2.

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