Question 23

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Jambmaths question: 

If $\left( \begin{matrix}   x+3 & x+2  \\   x+1 & x-1  \\\end{matrix} \right)$, evaluate x if $\left| P \right|=-10$

Jamb Maths Solution: 

$\begin{align}  & \left| \begin{matrix}   x+3 & x+2  \\   x+1 & x-1  \\\end{matrix} \right|=-10 \\ & (x+3)(x-1)-(x+1)(x+2)=-10 \\ & {{x}^{2}}+2x-3-{{x}^{2}}-3x-2=-10 \\ & -x-5=-10 \\ & -x=-5 \\ & x=5 \\\end{align}$

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