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Question

Find the other polynomial q (x) of the following, given that LCM, GCD and one polynomial p(x) respectively. (4x+5)3(3x7)3,(4x+5)(3x7)2,(4x+5)3(3x7)2

A
(3x7)3(4x+5)
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B
(3x+7)3(4x+5)
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C
(3x7)3(4x5)
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D
None of these
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Solution

The correct option is A (3x7)3(4x+5)

We know that if p(x) and q(x) are two polynomials, then p(x)×q(x)= {GCD of p(x) and q(x)}× {LCM of p(x) and q(x)}.

Now, it is given that one of the polynomial is p(x)=(4x+5)3(3x7)2, the LCM is (4x+5)3(3x7)3 and the GCD is (4x+5)(3x7)2, therefore, we have:

((4x+5)3(3x7)2)(q(x))=(4x+5)(3x7)2×(4x+5)3(3x7)3

((4x+5)3(3x7)2)(q(x))=(4x+5)4(3x7)5

q(x)=(4x+5)4(3x7)5(4x+5)3(3x7)2

q(x)=(4x+5)(3x7)3

Hence, the other polynomial q(x) is (3x7)3(4x+5).

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