Question

If a = i + j+, b = 2î +2j + 2k, and c = 3 +3; +3k then a+b+c=​

Answer 1

Answer:

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