No44 Jika vektor a = i + 3j -2k dan b = 4i -2j + 4k. Nilai a.b adalah... Select one: a. 15 b. -4 c. -10 d. 12 e. 3
Matematika
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Pertanyaan
No44
Jika vektor a = i + 3j -2k dan b = 4i -2j + 4k. Nilai a.b adalah...
Select one:
a. 15
b. -4
c. -10
d. 12
e. 3
Jika vektor a = i + 3j -2k dan b = 4i -2j + 4k. Nilai a.b adalah...
Select one:
a. 15
b. -4
c. -10
d. 12
e. 3
2 Jawaban
-
1. Jawaban AnugerahRamot
a = i + 3j - 2k
b = 4i - 2j + 4k
a.b = (1)(4) + (3)(-2) + (-2)(4)
a.b = 4 - 6 - 8
a.b = - 10
C -
2. Jawaban dnnyz07
Vektor
a = (1) i + 3j - 2k
b = 4i - 2j + 4k
a . b
= (a1)(b1) + (a2)(b2) + (a3)(c3)
= (1)(4) + (3)(-2) + (-2)(4)
= 4 - 6 - 8
= -10
C.