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Question

Factorise (4x+y)2+(4x+y)(x+2y)20(x+2y)2.

A
(9x+11y)(x+9y)
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B
(9x+11y)(x9y)
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C
(9x+11y)(7y)
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D
(9x11y)(x9y)
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Solution

The correct option is C (9x+11y)(7y)
(4x+y)2+(4x+y)(x+2y)20(x+2y)2.
We know, (a+b)2=a2+2ab+b2

16x2+8xy+y2+4x2+8xy+xy+2y220(x2+4xy+4y2)

20x2+17xy+3y220x280xy80y2

63xy77y2

(7y)(9x11y)

(9x+11y)(7y)

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