1
Question
Factorise:
z−7+7xy−xyz
z−7+7xy−xyz
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Solution
z−7+7xy−xyz
=z−xyz−7+7xy
=z(1−xy)−7(1−xy)
=(1−xy)(z−7)
Hence z−7+7xy−xyz=(1−xy)(z−7).
=z−xyz−7+7xy
=z(1−xy)−7(1−xy)
=(1−xy)(z−7)
Hence z−7+7xy−xyz=(1−xy)(z−7).
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