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+1 vote
19.1k views
in Vector Algebra – I by (49.1k points)
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Vectors (a and b) are inclined at an angle θ = 120°. If vector |a| = 1, vector |b| = 2, then [(a + 3b) x (3a - b)]2 is equal to …

(a) 225

(b) 275 

(c) 325 

(d) 300

1 Answer

+2 votes
by (46.9k points)
selected by
 
Best answer

Answer is (d) 300

Now 

= -10 vector(a x b)

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