Question

if a=i-2j-3k,b=2i+j-k and c=i+3j-2k, the find the value of c*(a*b).​

Answer 1

Answer:

Correct option is

D

8

Given, a=2i+2j+3k,b=−1+2j+k and c=3i+j

We need to find value of a+tb⊥c

⇒(a+tb)⋅c=0

⇒a⋅c+tb⋅c=0

⇒t=−

b⋅c

a⋅c

⇒t=−

(−i+2j+k)⋅(3i+j)

(2i+2j+3k)⋅(3i+j)

⇒t=−

−3+2+0

6+2+0

=8

Step-by-step explanation:

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