Bab 3 Vektor
LKS 1
Soal dan Jawaban Matematika Kelas X Sukino
5. Jika x = 3a - 2b + c , y = a + 3b - c , dan z = 2a + 6b - c , maka 5x - 2z - 3y adalah ...
A. -8a + 31b - 10c
B. -8a - 31b + 10c
C. 8a - 31b + 10c
D. 8a + 31b - 10c
E. 8a + 31b + 10c
Jawaban : C
5x = 5 (3a - 2b + c)
= 15a - 10b + 5c
2z = 2 ( 2a + 6b - c )
= 4a + 12b - 2c
3y = 3 (a + 3b - c)
= 3a + 9b - 3c
5x - 2z - 3y = 15a - 10b + 5c - 4a - 12b +2c - 3a - 9b + 3c
5x - 2z - 3y = 8a - 31b + 10c
>>Soal 6
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