A= 5 i â’ 3 J and B = â’i â’ 6 j
A+ B
=5 i â’ 3 j â’i â’ 6 j = 4 i - 9 j ---answer
A - B
= 5 i â’ 3 j + i + 6 j = 6 i + 3j ---answer
|A+B|
= sq root [ 16 + 81] = 9.848 ---answer
|A - B|
= sq root [ 36 + 9] = 6.708 ---answer
directions of A+ B
= tan (-1) -9 /4 = - 66 deg --answer
direction of A- B
= tan (-1) 3 /6 = 26.56 deg --answer
