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anonymous

  • one year ago

Please help, -3xyz for x = -3/4 , y = 5/9 and z = -8/15

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  1. anonymous
    • one year ago
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    Its evaluate

  2. anonymous
    • one year ago
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    Replace the variable with the numbers they're equal to \[-3\left(- \frac{ 3 }{ 4 } \right)\left( \frac{ 5 }{ 9 } \right)\left(- \frac{ 8 }{ 15 } \right)\] You can write 3 as 3/1 if it makes it easier \[\left(- \frac{ 3 }{ 1 } \right)\left(- \frac{ 3 }{ 4 } \right)\left( \frac{ 5 }{ 9 } \right)\left(- \frac{ 8 }{ 15 } \right)\] From here, you can cancel common factors and then multiply. Or multiply and then reduce at the end

  3. anonymous
    • one year ago
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    I did that, but my teacher was like no.

  4. anonymous
    • one year ago
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    - 9 / 4?

  5. anonymous
    • one year ago
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    |dw:1441192359993:dw|

  6. anonymous
    • one year ago
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    lol what the heck! ? ahh

  7. anonymous
    • one year ago
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    im confused now

  8. anonymous
    • one year ago
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    |dw:1441192517680:dw|

  9. anonymous
    • one year ago
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    |dw:1441192594395:dw|

  10. anonymous
    • one year ago
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    |dw:1441192656064:dw|

  11. anonymous
    • one year ago
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    There are 3 negative signs, so the answer is negative. So you're left with -2/3

  12. anonymous
    • one year ago
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    oh okay, i think i understand!

  13. anonymous
    • one year ago
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    if i were to show my work how could i do it an easy way to read?

  14. anonymous
    • one year ago
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    It's definitely better to cancel when you can because then you're not left with big numbers, and you might not even have to multiply anything. To show your work, maybe write the problem once, then write it again showing the canceling. Your teacher should understand that as written, it's pretty common

  15. anonymous
    • one year ago
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    put it like this

  16. anonymous
    • one year ago
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    |dw:1441192972789:dw|

  17. anonymous
    • one year ago
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    That second line probably isn't necessary. It just helps with readability.

  18. anonymous
    • one year ago
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    lol okay, thanks!

  19. anonymous
    • one year ago
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    i have a quiz tommorow so thats why i have to show my work.

  20. anonymous
    • one year ago
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    ah ok. You're welcome :)

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spraguer (Moderator)
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