Pakai rumusnya yah kka. Matriks X yang memenuhi persamaan ( 2 7 ) X= ( -3 8 ) ( 5 3 ) ( 7 -9 ) adalah... a. ( 2 -3 ) ( -1 2 ) b. ( 2 3 ) (-1 -2 ) c. ( 3 -
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Pertanyaan
Pakai rumusnya yah kka.
Matriks X yang memenuhi persamaan ( 2 7 ) X= ( -3 8 )
( 5 3 ) ( 7 -9 ) adalah...
a. ( 2 -3 )
( -1 2 )
b. ( 2 3 )
(-1 -2 )
c. ( 3 -1 )
(-2 2 )
d. ( -1 2 )
( 3 -2 )
e. ( 2 3 )
( 1 -1 )
Matriks X yang memenuhi persamaan ( 2 7 ) X= ( -3 8 )
( 5 3 ) ( 7 -9 ) adalah...
a. ( 2 -3 )
( -1 2 )
b. ( 2 3 )
(-1 -2 )
c. ( 3 -1 )
(-2 2 )
d. ( -1 2 )
( 3 -2 )
e. ( 2 3 )
( 1 -1 )
1 Jawaban
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1. Jawaban Resevoa
Anggap ( 2 7) = A (-3 8) = C
( 5 3 ) (7 -9)
A.X = C
X = A^-1C
X = 1/detA . Adj A .C
= 1/6-35 .(3 -7) . (-3 8)
(-5 2) (7 -9)
= (-3/29 7/29) (-3 8)
( 5/29 -2/29) (7 -9)
= ( 9/29 + 7/29 -24/29 + (-63/29))
( -15/29 + (-14/29) 40/29 + 18/29)
= (16/29 -87/29)
(-29/29 58/29)