5," (a) Eyaluate the product "(3a^(3)-5vec b),(2vec a+7vec b)" ,"

Evaluate the product (3vec a-5vec b)*(2vec a+7vec b)

Evaluate the product (3 vec a-5 vec b).(2 vec a+7 vec b)

Evaluate the product (3 vec a-5 vec b)*(2 vec a+7 vec b) .

Evaluate the product (3vec(a)-5vec(b)).(2vec(a)+7vec(b)) .

Evaluate the product (3vec(a)-5vec(b)).(2vec(a)+7vec(b)) .

Evaluate the product (3 vec a + 5 vec b).(2 vec a + 7 vec b) .

Evaluate : (3vec(a)-5vec(b)).(2vec(a)+7vec(b)) .

If vec a and vec b are two vectors,such that |vec a|=2,|vec b|=1 and vec a*vec b=1, then find (3vec a-5vec b)*(2vec a+7vec b)

If vec a and vec b are two vectors such that |quad vec a|=2 , |quad vec b|=1 and vec a. vec b=1 , then find the value of (3 vec a - 5 vec b).(2 vec a+7 vec b) .