Baca Juga: Soal Asli PTS Ganjil Matematika Wajib Kelas 10 SMA, Nilai Mutlak
14. Jika [2 3] [x] = [ 7 ] maka x^2 + y^2 =...
5 -1 y -8
pembahasan :
[2x + 3y] = [ 7 ]
5x - 1y -8
2x + 3y = 7 I-1 I -2x -3y = -7
5x - 1y = -8 3 15x - 3y = -24
______________ -
-17x = 17
x = -1
2x + 3y = 7
2(-1) + 3y = 7
-2 + 3y = 7
3y = 7 + 2
3y = 7
y = 9/3
y = 3
masukan pada soal:
x^2 + y^2 = (-1)^2 + (3)^2 = 1 + 9 = 10
15. Diketahui [4 7] k = [3 1]
3 5 2 1
Determinan matriks k =...