Evaluate begin pmatrix 3 amp -2 -7 amp 5 end pm... - JAMB Mathematics 2007 Question
Evaluate\(\begin{pmatrix} 3 & -2 \ -7 & 5\end{pmatrix}\) + 2\(\begin{pmatrix} -2 & 4 \ 3 & -1\end{pmatrix}\)
A
\(\begin{pmatrix}-1 & 6 \ -1 & 3\end{pmatrix}\)
B
\(\begin{pmatrix} 3 & 4 \ -2 & 6\end{pmatrix}\)
C
\(\begin{pmatrix} -1 & 6 \ 1 & 3\end{pmatrix}\)
D
\(\begin{pmatrix} 3 & 4 \ 2 & 6\end{pmatrix}\)
correct option: a
\(\begin{pmatrix} 3 & -2 \ -7 & 5\end{pmatrix}\) + 2\(\begin{pmatrix} -2 & 4 \ 3 & -1\end{pmatrix}\) = \(\begin{pmatrix} 3 & -2 \ -7 & 5\end{pmatrix}\) + \(\begin{pmatrix} -4 & 8 \ 6 & -2\end{pmatrix}\)
= \(\begin{pmatrix} 3 & -4 \ -7 & 6\end{pmatrix}\) + 2\(\begin{pmatrix} -2 & 8 \ 5 & -2\end{pmatrix}\)
= \(\begin{pmatrix}-1 & 6 \ -1 & 3\end{pmatrix}\)
= \(\begin{pmatrix} 3 & -4 \ -7 & 6\end{pmatrix}\) + 2\(\begin{pmatrix} -2 & 8 \ 5 & -2\end{pmatrix}\)
= \(\begin{pmatrix}-1 & 6 \ -1 & 3\end{pmatrix}\)
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