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If vector a = vector(i + j + 2k) and vector b = vector(3i + 2j - k), then the value of vector(a + 3b).(2a - b) is (a) 15 (b) 18 (c) -18 (d) -15

+2 votes
in Class 12 by kratos

If vector a = vector(i + j + 2k) and vector b = vector(3i + 2j - k), then the value of vector(a + 3b).(2a - b) is

(a) 15

(b) 18

(c) -18

(d) -15

1 Answer

+6 votes
by kratos
 
Best answer

Answer is (d) -15

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