anonymous
  • anonymous
Find the dot product, a • b. a = 6i + 5j, b = -5i + 4j
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
whats so hard about this @Nairz 6i+5j*-5i+4j 6i(-5i+4j) +5(5i+4j) can you solve this?
anonymous
  • anonymous
I haven't done this in a long time. Just need a refresher :)
anonymous
  • anonymous
so are u refreshed now

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

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