Question 23

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Jambmaths question: 

If $\left| \begin{matrix}   -x & 12  \\   -1 & 4  \\\end{matrix} \right|=-12$, find x

Option A: 

3

Option B: 

6

Option C: 

–6

Option D: 

–2

Jamb Maths Solution: 

$\begin{align}  & \left| \begin{matrix}   -x & 12  \\   -1 & 4  \\\end{matrix} \right|=-12 \\ & 4x+12=-12 \\ & 4x=-24 \\ & x=-6 \\\end{align}$

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