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Question

Factorise the expression:
z7+7xyxyz.

A
(z+7)(1+xy)
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B
(z7)(1+xy)
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C
(x+7)(1zy)
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D
(z7)(1xy)
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Solution

The correct option is D (z7)(1xy)
Given, the expression is
z7+7xyxyz.
Taking '1' common from the first two terms and 'xy' common from the last two terms, we get
1(z7)xy(z7)
=(z7)(1xy)

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