waecmaths question:
Factorise $x+y-ax-ay$
Option A:
$(x-y)(1-a)$
Option B:
$(x+y)(1+a)$
Option C:
$(x+y)(1-a)$
Option D:
$(x-y)(1+a)$
waecmaths solution:
$\begin{align} & x+y-ax-ay=(x+y)-a(x+y) \\ & =(1-a)(x+y) \\ & =(x+y)(1-a) \end{align}$
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