Question

for what value of a, the vector 2i-4j+k and 2i+aj-8k are perpendicular to each other​

Answer 1

Step-by-step explanation:

If two vector are perpendicular , then dot product will zero .

Then,

(2i-4j+k).(2i+aj-8k)=0

✓ (4-4a-8)=0

✓ -4a=4

✓ a=4/-4

✓ a=-1

The value of 'a' is -1 .