Factorise :z – 7 + 7xy – xyz - Vidyadip

Question

Factorise :$z – 7 + 7xy – xyz$

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Answer

$z – 7 + 7xy – xyz$
$= z – 7 – xyz + 7xy$
$= 1(z – 7) – xy (z – 7)$
$= (z – 7) (1 – xy).$

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