Find the dot product, a • b. a = 6i + 5j, b = -5i + 4j

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Find the dot product, a • b. a = 6i + 5j, b = -5i + 4j

Mathematics
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whats so hard about this @Nairz 6i+5j*-5i+4j 6i(-5i+4j) +5(5i+4j) can you solve this?
I haven't done this in a long time. Just need a refresher :)
so are u refreshed now

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Other answers:

so just simplify that equation you wrote?
remember that i*j = 0
yeah multiply it gonna show one 6i(-5i+4j) 6i*-5i + 6i*4j then simply it, do it for both and then add subract, pretty basic
and when he says that i x j = 0 does that mean that 6i x 4j = 0? @snoo
@cwrw238 pl0x cum
6i x 4j = 24*ij = 24*0 = 0
^
do same with other one, @Nairz
doesn't dot mean xc+yd
ok thanks @snoo and @cwrw238
btw, call me daddy, i'm out :)
\[<6,5> \cdot <-5,4>=6(-5)+5(4)\]
omg yes.
so -30 + 20 or 10
well -30+20 is -10
oh whoops
i forgot to put in the - sign
i'm an old man i m sorry i was thinking of multiplying as adding, im so sorry dear
I think we all get things a little mixed up sometimes. Math is huge subject after all.
thanks dear

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