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anonymous

  • 5 years ago

how do you do cross product

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  1. anonymous
    • 5 years ago
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    Better shown by example. As a specific question with numbers and such.

  2. anonymous
    • 5 years ago
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    3/4=15/20

  3. anonymous
    • 5 years ago
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    3*20=15*4

  4. anonymous
    • 5 years ago
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    so thats it

  5. anonymous
    • 5 years ago
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    Are you talking about cross multiply algebra, or cross vector calculus?

  6. anonymous
    • 5 years ago
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    He's talking about algebra.

  7. anonymous
    • 5 years ago
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    \[{x \over 4} = {15 \over 20}\] \[\implies ({20 \times 4}) {x \over 4} = ({20 \times 4}) {15 \over 20}\] \[\implies 20x =4(15) \implies 20x = 60 \implies x = 3\]

  8. anonymous
    • 5 years ago
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    All you're doing is multiplying both sides by the product of the two denominators.

  9. anonymous
    • 5 years ago
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    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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