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Matriks
Kelas X

1.)
a₃₂ + (a₄₁)² - a₃₂ ... seperti itu ?
= (a₄₁)²
= (-3)² = 9

2.)
[tex] 3 \left(\begin{array}{cc} 4 & 2 \\ x & 1 \end{array}\right) - \left(\begin{array}{cc} -x & -1 \\ 3 & y \end{array}\right) = \left(\begin{array}{cc} 10 & 7 \\ -9 & 2 \end{array}\right) \\
\left(\begin{array}{cc} 12 & 6 \\ 3x & 3 \end{array}\right) - \left(\begin{array}{cc} -x & -1 \\ 3 & y \end{array}\right) = \left(\begin{array}{cc} 10 & 7 \\ -9 & 2 \end{array}\right) [/tex]

Didapat :
12 + x = 10
x = -2

3 - y = 2
y = 1

Maka
2x + y = 2(-2) + 1 = -3

3.)
[tex] \left(\begin{array}{cc} 1 & -1 & 3 \\ 0 & 2 & 1 \end{array}\right) \left(\begin{array}{cc} -1 & 2 \\ 2 & 0 \\ 1 & -1 \end{array}\right) \\
= \left(\begin{array}{cc} 0 & -1 \\ 3 & 1 \end{array}\right) = C \\
\\
Maka \ : \\
C^T = \left(\begin{array}{cc} 0 & 3 \\ -1 & 1 \end{array}\right) [/tex]