May 2021 0 83 Report
Diketahui vektor a= i + 2j - xk
b= 3i - 2j + k
c= 2i + j + 2k
jika vektor a tegak lurus dengan vektor c, maka nilai dari (a+b)•(a-c) adalah...
A. -4
B. -2
C. 0
D. 2
E. 4


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