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Question

Which of the following is the factor of 4a2+b2−4ab+2b−4a+1

A
ab
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B
a+b2
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C
ab+2
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D
2ab1
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Solution

The correct option is D 2ab1
4a2+b24ab+2b4a+1
=(2a)22(b)(2a)2(2a)+(b2+2b+1)
=(2a)22(2a)(b+1)+(b+1)2
=(2a(b+1))2
=(2ab1)(2ab+1)

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