# AS Further MathsWatch

#1
I don't get how to do this, I get why i.j = j.k = k.i = 0 but I don't get how I use that to solve it
https://imgur.com/gallery/iguHGoq
Thanks for any help
Last edited by jackwhurt; 6 days ago
0
6 days ago
#2
(Original post by jackwhurt)
I don't get how to do this, I get why i.j = j.k = k.i = 0 but I don't get how I use that to solve it
https://imgur.com/gallery/iguHGoq
Thanks for any help

Now expand the two brackets and use that fact.
0
#3
(Original post by RDKGames)

Now expand the two brackets and use that fact.
where am i getting a3 and b3 from?
0
6 days ago
#4
(Original post by jackwhurt)
where am i getting a3 and b3 from?
Yeah just noticed... they meant:

1
#5
(Original post by RDKGames)
Yeah just noticed... they meant:

Alright, thanks mate
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