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= √(4 + 9 + 16)
= √(29)
2. a + b = 2ì + 3j + 4k + 4ì + j - 2k
= 6i + 4j - 2k
la+bl = √(6² + 4² + (-2)²)
= √(36+16+4)
= √56
= 2√14
3. b-a = 4ì + j - 2k - (2ì + 3j + 4k)
= 2i - 2j - 6k
2 lb-al = 2 √(4 + 4 + 36)
= 2√44
= 4√11
4. vektor satuan a = (2ì + 3j + 4k) / (√29)
= (2/√29)i + (3/√29)j + (4/√29)k
5 lbl = √(4²+1²+(-2)²)
= √21
vektor satuan b = (4ì + j - 2k)/√21
= (4/√21)i + (1/√21) - (2/√21)k