anonymous
  • anonymous
how do you do cross product
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Better shown by example. As a specific question with numbers and such.
anonymous
  • anonymous
3/4=15/20
anonymous
  • anonymous
3*20=15*4

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anonymous
  • anonymous
so thats it
anonymous
  • anonymous
Are you talking about cross multiply algebra, or cross vector calculus?
anonymous
  • anonymous
He's talking about algebra.
anonymous
  • anonymous
\[{x \over 4} = {15 \over 20}\] \[\implies ({20 \times 4}) {x \over 4} = ({20 \times 4}) {15 \over 20}\] \[\implies 20x =4(15) \implies 20x = 60 \implies x = 3\]
anonymous
  • anonymous
All you're doing is multiplying both sides by the product of the two denominators.
anonymous
  • anonymous
Since each side is over one of the two denominators that will cancel with one of the factors in your product.

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