Please explaim the solution step by step Please - Maths - Vector Algebra

Question

Please explaim the solution step by step Please

Ram Manohar Thakur · Accepted Answer

Dear Student
<img alt="solution" src=
"https://toppr-doubts-media%20s3%20amazonaws%20com/images/9650462/e6ea3e81-30ec-44bc-8aad-7bb8af6b75f7%20jpg">
Regards

Please explaim the solution step by step. Please.