October 2018 1 8 Report
Tolong di bantu jawab dan cara penyelesaiannya !

Vektor - vektor p = 2i + aj + k dan q = 4i - 2j - 2k ,saling tegak lurus untuk a bernilai ..
A. 3
B. 4
C. 4,5
D. 5
E. 6

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