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Question

Find the GCD of the following x2+3xy+2y2,x2+5xy+6y2

A
x+2y
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B
x2y
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C
2x+2y
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D
None of these
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Solution

The correct option is D x+2y
We first factorize the given polynomials x2+3xy+2y2 and x2+5xy+6y2 as shown below:

x2+3xy+2y2=x2+xy+2xy+2y2=x(x+y)+2y(x+y)=(x+y)(x+2y)

x2+5xy+6y2=x2+2xy+3xy+6y2=x(x+2y)+3y(x+2y)=(x+3y)(x+2y)

The common factor of x2+3xy+2y2 and x2+5xy+6y2 is (x+2y), therefore, the GCD is x+2y.

Hence, the greatest common divisor of x2+3xy+2y2 and x2+5xy+6y2 is x+2y.

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