Question

If A+B= 7i+7k and A-B=-i + k then the magnitude of A will be​

Answer 1

Answer:

A+B =7i+7k ->(1)

A-B = i+k ->(2)

add equation 1 and 2 , we get the answer :

2A = 8i+8k

2A = 8(i+k)

A = 8/2(i+k)

A = 4(i+k)

A = 4i+4k

|A| =√(4)²+(4)²

|A| = √16 +16

|A| = √32

A = 5.6568