Question

༒ Bʀᴀɪɴʟʏ Sᴛᴀʀs ༒Mᴏᴅᴇʀᴀᴛᴇʀs ༒Other best user if a = 5i - j -3k and b= i+3j-5k, then show that the vectors a+b and a-b are perpendicular Spammer go away​

Answer 1

Answer:

The condition of two vectors are to be perpendicular to each other if dot product of two vectors is zero. i.e, A.B=0

or (3i^−5j^+5k^).(5i^−j^+bk^)=0

or 15+5+5b=0

or b=−4 or ∣b∣=∣−4∣=4