Matematika Peminatan Kelas X
Perkalian Silang (Cross Product)
Latihan Vektor
2. Jika a = √3 i + k dan b = √3 j + k . Maka a . (a + b) = ...
a. 6
b. 5
c. 4
d. 3
e. 2
Jawaban : B
a = √3 i + k
b = √3 j + k
a + b = √3 i + k + √3 j + k
a + b = √3 i + √3 j + 2k
a . (a + b) = (√3 i + k) . (√3 i + √3 j + 2k)
a . (a + b) = (√3 . √3 + 0 . √3 + 1 . 2 )
a . (a + b) = 3 + 2
a . (a + b) = 5
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