Question

Please help me. I am giving you 15 points

Answer 1

Explanation:

|a. bar. - b. bar|

=|2i`-4j`-(-4i`+4j`)|

=|2i`-4j`+4i`-4j`|

=|6i`-8j`|

= 6*2 -8*2

=36-64

=-28

|a. bar. + b. bar|

=|2i`-4j`+(4i`+4j`)|

=|2i`-4j`+4i`+4j`|

=|6i`|

=6*2

=36

now

|a .bar. - b. bar |

=-------------

|a. bar. + b. bar|

-28

= --

36