Question

If the vector 2i+j-5k and pi+3j+4k are perpencicular to each other find the value of p ?

Answer 1

Answer:

Step-by-step explanation:

let a = 2i+j - 5k

    b = pi+ 3j+4k

if two vectors are perpendicular , dot product = 0

i.e a.b=0

a.b= 2.p+ 1.3+ (-5).4

     = 2p+ 3-20

     = 2p -17

a.b=0

2p-17=0

p=17/2

p= 8.5