Jambmaths question:
Divide the expression ${{x}^{3}}+7{{x}^{2}}-x-7$ by ${{x}^{2}}-1$
Option A:
$x-1$
Option B:
$x+1$
Option C:
$x-7$
Option D:
$x+7$
Jamb Maths Solution:
$\begin{align} & {{x}^{2}}-1\overset{x+7}{\overline{\left){\begin{align} & {{x}^{3}}+7{{x}^{2}}-x-7 \\ & \underline{{{x}^{3}}\text{ }-x} \\\end{align}}\right.}} \\ & \text{ }7{{x}^{2}}-7 \\ & \text{ }\underline{\text{ }7{{x}^{2}}-7} \\ & \text{ }------ \\ & \frac{{{x}^{3}}+7{{x}^{2}}-x-7}{{{x}^{2}}-1}=x+7 \\\end{align}$
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