Find the unit vector for Leave in simplified radical form. The answer is How do i get there?

Question

Find the unit vector for <7,-2> Leave in simplified radical form. The answer is <(Sqrt)53/53, 2(Sqrt)53/53> How do i get there?

anonymous · Answer

@LangstonK Why do you close then open exact same post ???

anonymous · Answer

Sorry i needed to fix it because i have the answer but not reason why

anonymous · Answer

and idk if people see the change so

anonymous · Answer

In your 2-month old post, you told "it's easy"!

anonymous · Answer

It is different  now because my teacher gave us the answer and i dont know why its not like last time. Last time it was easy because i just put the vector on top. This time he has different numbers as numerator

anonymous · Answer

Check my response in your previous closed post! It just different form!