Question

physics 12th question pls someone help​

Answer 1

Answer:

Step-by-step explanation:

A.B=(3i+4j)(2i-5j) {I.i=j.j=k.k=1,I.j=j.i=j.k=k.j=I.k=k.i=0}

=3×3+4×(-5)

= 9-45

=-36

A×B =(3i+4j)×(2i-5j) {i×j=k,j× I=-k}

=-15k-8k

=23k