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18jonea

  • one year ago

Solve the following expression for x: 81=3(x+y)^3 x = 243 - y x = 27 - y x = 3 - y x = 9 - y

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  1. 18jonea
    • one year ago
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    @Michele_Laino

  2. 18jonea
    • one year ago
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    @Miracrown

  3. anonymous
    • one year ago
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    Ill try to help you but I'm not gonna put a answer if i think I'm wrong

  4. mathstudent55
    • one year ago
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    \(81=3(x+y)^3\) Divide both sides by 3. What do you get?

  5. 18jonea
    • one year ago
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    27

  6. 18jonea
    • one year ago
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    what three am i taking away on the side though the exponent or the first 3

  7. 18jonea
    • one year ago
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    @mathstudent55

  8. 18jonea
    • one year ago
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    @Michele_Laino

  9. Michele_Laino
    • one year ago
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    hint: we can write this: \[\Large {\left( {x + y} \right)^3} = \frac{{81}}{3} = 27\]

  10. 18jonea
    • one year ago
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    ok then how do i get rid of the exponent

  11. Michele_Laino
    • one year ago
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    you have to take the third rooth of both sides

  12. 18jonea
    • one year ago
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    so how would i do that?

  13. 18jonea
    • one year ago
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    how do you takw the 3 root of both sides

  14. mathstudent55
    • one year ago
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    Correct. \(27=(x+y)^3\) Now we notice that \(27 = 3^3\), so we write: \(3^3 = (x + y)^3\) If the third power of 3 equals the third power of x + y, then 3 must equal x + y. You can also take the cubic root of both sides. \(3 = x + y\) There is only one step left. Subtract y from both sides.

  15. 18jonea
    • one year ago
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    so would it be 3-y=x @Michele_Laino or 9-y= x

  16. Michele_Laino
    • one year ago
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    it is the first one, namely x+y=3

  17. 18jonea
    • one year ago
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    ok

  18. 18jonea
    • one year ago
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    The following equation is used to determine the kinetic energy of an object: E=1/2mv^2. Solve for m:

  19. 18jonea
    • one year ago
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    @Michele_Laino

  20. 18jonea
    • one year ago
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    would it be 2E/ v^2

  21. 18jonea
    • one year ago
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    @mathstudent55

  22. Michele_Laino
    • one year ago
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    correct!

  23. 18jonea
    • one year ago
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    Thank you

  24. 18jonea
    • one year ago
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    Write an expression for the following description: 23 less than the product of x and 6. 6x-23 is that right

  25. 18jonea
    • one year ago
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    @Michele_Laino

  26. Michele_Laino
    • one year ago
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    yes!

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