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Matematika Peminatan SMA Kelas XII
Karena keterbatasan, lambang vektor dapat pula ditulis sebagai vektor baris
[1] Informasi soal terdapat pada gambar foto
(a)
a + b - c = [1, 3, 4] + [4, -1, 2] - [1, 3, 0]
∴ a + b - c = [4, -1, 6]
(b)
a + 2b - 3c = [1, 3, 4] + 2[4, -1, 2] - 3[1, 3, 0]
a + 2b - 3c = [1, 3, 4] + [8, -2, 4] - [3, 9, 0]
∴ a + 2b - 3c = [6, - 8, 8]
[2]
(a)
a + b = [1, 2, 4] + [3, 1, 1]
a + b = [4, 3, 5]
| a + b| = √ [4² + 3² + 5²]
∴ | a + b| = √ [16 + 9 + 25] ⇒⇒ 5√2
(b)
2a - b = 2.[1, 2, 4] - [3, 1, 1]
2a - b = [2, 4, 8] - [-3, -1, -2]
2a - b = [5, 5, 10]
| 2a - b | = √ [5² + 5² + 10²]
∴ | 2a - b | = √150 ⇒⇒ 5√6
Lambang vektor yang lazim yakni vektor kolom (atau vektor satuan dengan i, j, dan k) dapat ditulis kembali di buku tulis PR