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Solmyr

  • 3 years ago

Find the difference of (−5x2 − 4x3 − 3) − (9x3 + 3x − 8x2). Be sure to show all of your work in a neat and organized fashion. Use the ^ (shift 6) symbol to show an exponent. For example, x squared can be written as x^2.

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  1. Solmyr
    • 3 years ago
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    (-25x - 64x - 3) - (729x + 3x - 64x) ????

  2. Solmyr
    • 3 years ago
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    Please help

  3. bronzegoddess
    • 3 years ago
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    you need to subtract like terms x^2 minus x^2

  4. Solmyr
    • 3 years ago
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    so the -5x^2 and -8x^2?

  5. bronzegoddess
    • 3 years ago
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    yes, and you get?

  6. Solmyr
    • 3 years ago
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    add 8 to boith sides and get 3x^2

  7. bronzegoddess
    • 3 years ago
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    yes your answer is right but your method is fishy.. any go on :) i would say -5x^2--8x^2 = -5x^2+8x^2=3x^2

  8. Solmyr
    • 3 years ago
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    ok

  9. bronzegoddess
    • 3 years ago
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    do the same for the rest, and give me your answer :)

  10. Solmyr
    • 3 years ago
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    -4x^3 and 9x^3

  11. bronzegoddess
    • 3 years ago
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    yes and ur answer?

  12. Solmyr
    • 3 years ago
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    or should the 9 be negative because the minus sign in between the two equations??

  13. bronzegoddess
    • 3 years ago
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    well, the 9 is postive but you have to subtract it from 4..

  14. bronzegoddess
    • 3 years ago
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    -4x^3-9x^3 is the same as -4x^3-+9x^3

  15. Solmyr
    • 3 years ago
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    -13x^3?

  16. bronzegoddess
    • 3 years ago
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    yes, and the last two terms, do they have partners?

  17. Solmyr
    • 3 years ago
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    no

  18. bronzegoddess
    • 3 years ago
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    lol, correct..not the same terms.. so your answer would be all the stuff together.. i'll give you a start: 3x^2-13x^3and the last two terms without partners

  19. Solmyr
    • 3 years ago
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    so 3x^2 - 13^3 + 3x - 3?

  20. bronzegoddess
    • 3 years ago
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    yes :) well done, by the way.. there is a difference between (5x)^2 and 5x^2.. do you know it?

  21. Solmyr
    • 3 years ago
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    no

  22. bronzegoddess
    • 3 years ago
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    (5x)^2= 5^2x^2=25x^2 5x^2 is just 5x^2 :) next time you should write your question with the exponents to avoid complications :)

  23. Solmyr
    • 3 years ago
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    ok thank you for all the help

  24. bronzegoddess
    • 3 years ago
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    you are welcome, you are a great learner :)

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