yang tau tolongin dong pr matematika matriks

1.
a) |det|ad - cb = 4  --> |det|cb - ad = -4
b) |det|4cb - 4ad = 4(cb - ad) = 4 . (-4) = -16
2.
AB - C = [tex] \left[\begin{array}{cc}8&4\\1&13\end{array}\right] [/tex]
|det| = (13 x 8) - ( 1 x 4 )
       = 104 -4
       = 100
3.
[tex] \left[\begin{array}{cc}24&35\\3&28\end{array}\right] [/tex]
|det| = (28 x 24) - (3 x 35)
       = 672 - 105
       = 567
4.
2a² - 12 = 24 + 36
2a² = 60 + 12
 a  =[tex] \sqrt{36} [/tex]
     = 6
5.
R[tex] ^{-1} [/tex] . S[tex] ^{-1} [/tex] = [tex] \left[\begin{array}{cc} \frac{1}{4} &0\\0&1\end{array}\right] [/tex]
6. C1 = 3 : 3 = 1
    C2 = 1 : -2 = -[tex] \frac{1}{2} [/tex]
    C3 = 1 : -1 = -1
    C4 = 4 : 1 = 4
|det|C = (C4.C1) - (C3. C2)
         = (4 x 1) - (-1 x -[tex] \frac{1}{2} [/tex]
         = 3[tex] \frac{1}{2} [/tex]

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