Question

If vector a and vector B are two vectors then the value of vector A + vector B cross vector a minus vector b is

Answer 1

let vector A be xi + yj and B be ai +bj. Then A + B= (x+a)i +( y+b)j. Let vector b be fi + gj. The (A+B)×(-b)= [-g(x+a)]i -  [-f(y+b)]j.