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Question

Factorise: 4x4+3x2+1

A
(2x2+x+1)(2x2+x1)
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B
(2x2+x+1)(2x2x+1)
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C
(2x2+x1)(2x2x1)
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D
(2x2x+1)(2x2x1)
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Solution

The correct option is B (2x2+x+1)(2x2x+1)

Given, 4x4+3x2+1

4x4+4x2x2+14x4+4x2+1x2

(a+b)2=a2+2ab+b2

(2x2+1)2(x)2

a2b2=(a+b)(ab)

(2x2+1+x)(2x2+1x)

(2x2+x+1)(2x2x+1)


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