Question

h) Find the value of a if aî + 3j +8k and 4j- 4î +9k are perpendicular to each other?​

Answer 1

Answer:

For two vectors to be perpendicular-

a.b=0

⟹(2i+mj−3k). (i−2j+k) = 0

⟹2−2m−3 = 0

⟹m= 2 − 1

Answer 2

Answer:

a = -15

Step-by-step explanation:

aî + 3j +8k and 4j- 4î +9k are perpendicular to each other

(aî + 3j +8k) . (4j- 4î +9k) = 0

4a -12 +72=0

4a = -60

a = -15