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Question

Factorise: (x2+y2−z2)2−4x2y2

A
(x+y+z)(x+yz)(xy+z)(x+y+z)
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B
(x+y+z)(x+yz)(xy+z)(xyz)
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C
(x+y+z)(x+yz)(x+y+z)(xyz)
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D
(x+y+z)(x+yz)(xyz)(xyz)
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Solution

The correct option is B (x+y+z)(x+yz)(xy+z)(xyz)
(x2+y2z2)24x2y2=(x2+y2z2)2(2xy)2
=(x2+y2z2+2xy)(x2+y2z2+2xy)[a2b2(ab)(a+b)]
=(x2+2xy+y2z2)(x22xy+y2z2)
=[(x2+y2)2z2][(x2y2)2z2]
=(x+y+z)(x+yz)(xy+z)(xyz)

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