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BrianWest

help solving polinomial equations

  • one year ago
  • one year ago

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  1. BrianWest
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    \[x ^{3}+216=0\]

    • one year ago
  2. Mertsj
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    1. Subtract 216 from both sides 2. Take the third root of both sides.

    • one year ago
  3. BrianWest
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    what does it look like worked out, i am confused

    • one year ago
  4. inkyvoyd
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    Now now, don't you go human wolframing without giving the answer. ;)

    • one year ago
  5. Mertsj
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    Can you subtract 216 from both sides?

    • one year ago
  6. BrianWest
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    yes, i get x^3=-216

    • one year ago
  7. Mertsj
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    Do you know what a third root is?

    • one year ago
  8. Mertsj
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    For example, the third root of 8 is 2 because 2 raised to the third power is 8

    • one year ago
  9. BrianWest
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    yes, the thierd root of 216=6 x=6

    • one year ago
  10. Mertsj
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    |dw:1363827771232:dw|

    • one year ago
  11. Mertsj
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    What is the third root of -216?

    • one year ago
  12. BrianWest
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    -6i

    • one year ago
  13. BrianWest
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    -6 or 6i

    • one year ago
  14. Mertsj
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    Just plain -6 because -6 x -6 x -6 = -216

    • one year ago
  15. BrianWest
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    so my answer is -6... correct

    • one year ago
  16. Mertsj
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    Correct. Very good.

    • one year ago
  17. BrianWest
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    please help,how do you work. confused. if p(x)=3x^2x+5 and r(x)=x^3 +x+1, find each value.. problem: 4p(a)

    • one year ago
  18. Mertsj
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    Find the p(a) be replacing each x with a Find 4p(a) by multiplying that result by 4

    • one year ago
  19. BrianWest
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    i have p(a) = 3a^2 -2a +5

    • one year ago
  20. BrianWest
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    my final answer is 4p(a) = 45 is this correct???

    • one year ago
  21. BrianWest
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    is this correct

    • one year ago
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