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magepker728

  • 3 years ago

(x-3)^3+8=0

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  1. helder_edwin
    • 3 years ago
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    add -8 to both sides

  2. magepker728
    • 3 years ago
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    well i got to this part x^3-19=0

  3. helder_edwin
    • 3 years ago
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    no \[ \large (x-3)^3=-8 \]

  4. magepker728
    • 3 years ago
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    k then

  5. helder_edwin
    • 3 years ago
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    now take cubic roots of each side

  6. magepker728
    • 3 years ago
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    x-3=2i?

  7. KE8717504
    • 3 years ago
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    yes

  8. helder_edwin
    • 3 years ago
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    no \[ \large \sqrt[3]{(x-3)^3}=\sqrt[3]{-8}=-2 \]

  9. helder_edwin
    • 3 years ago
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    then u have \[ \large x-3=-2 \]

  10. magepker728
    • 3 years ago
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    ook so now why did you subtract 8 from both side instead of doing the parenthesis

  11. helder_edwin
    • 3 years ago
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    if u had done that, in the end u would have had to use syntthetic division or something else to solve the equation. it is not a bad idea, but it is harder

  12. magepker728
    • 3 years ago
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    so how do know when to do your method

  13. magepker728
    • 3 years ago
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    how would i know when do apply your method

  14. helder_edwin
    • 3 years ago
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    did they teach the order of operations?

  15. magepker728
    • 3 years ago
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    nop

  16. helder_edwin
    • 3 years ago
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    come on... for real??

  17. magepker728
    • 3 years ago
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    oo my bad didnt read read the question right

  18. helder_edwin
    • 3 years ago
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    well. take a look at this \[ \large (7-3)^8+8= \]

  19. helder_edwin
    • 3 years ago
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    tell me step by step how would u compute this

  20. magepker728
    • 3 years ago
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    if i were do do this i would find the difference of the number in parenthesis, then raise the result to the 8th power and then add it to 8

  21. helder_edwin
    • 3 years ago
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    great

  22. helder_edwin
    • 3 years ago
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    to solve an equation u do that but in reverse order: 1st undo +8 2nd undo ^3 3rd undo -3 got it?

  23. magepker728
    • 3 years ago
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    hmm

  24. helder_edwin
    • 3 years ago
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    did they (your teachers) taught you this?

  25. magepker728
    • 3 years ago
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    i dont remember something like this lol

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