waecmaths question:
Which of the following is a factor of $2-x-{{x}^{2}}$
Option A:
1 – x
Option B:
1 + x
Option C:
x – 1
Option D:
2 – x
waecmaths solution:
$\begin{align} & 2-x-{{x}^{2}}=2+x-2x-{{x}^{2}} \\ & =1(2+x)-x(2+x) \\ & =(1-x)(2+x) \end{align}$
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