Question

If bar(A)=(3 i+4 j) and bar(B)=(2 i- j) then value of bar(A)*bar(B) is​

Answer 1

Answer

6i^2+5ij-4j^2

Explanation:

Bar-A= 3i +4j

Bar-B= 2i-j

Value = BarA×BarB

= (3i+4j) ×(2i-j)

=3i(2i)+3i(-j)+4j(2i)+4j(-j)

=6i^2 +(-3ij)+8ij+(-4j^2)

= 6i^2 +5ij-4j^2