Please help me. I am giving you 15 points
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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
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