matriks part 1 help....

Penyelesaian:

Dik: [tex]P = \left[\begin{array}{cc}12&4\\0&-11\end{array}\right] [/tex]
[tex]M^T = \left[\begin{array}{cc}x&2y\\-3&4\end{array}\right] [/tex]
[tex]R = \left[\begin{array}{cc}96&-20\\66&-44\end{array}\right] [/tex]

Nilai 2xy...?

Jawab

P . M^T = R
[tex]P = \left[\begin{array}{cc}12&4\\0&-11\end{array}\right] [/tex] . [tex]M^T = \left[\begin{array}{cc}x&2y\\-3&4\end{array}\right] [/tex] = [tex]R = \left[\begin{array}{cc}96&-20\\66&-44\end{array}\right] [/tex]

Lakukan perkalian matriks, didapat:

-22y = 66
y = -3

12x + 8y = 96
12x + 8(-3) = 96
12x = 120
x = 10

Nilai 2xy = 2(10)(-3) = -60 (A).