Find|x| if (x - a).(x + a) = 12, where a is a unit vector.
This question is exactly same as Ex 10.3 , 9 – Chapter 10 Class 12 Vector Algebra From NCERT Book.
Please check https://www.teachoo.com/3411/746/Ex-10.3--9---Find--x--if-for-a-unit-vector-a-(x---a).(x---a)-12/category/Ex-10.3/