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anonymous

  • 5 years ago

(squaredrootof)-3x+6=x+4. Solving square root equations. :)

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  1. anonymous
    • 5 years ago
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    which part is under the sqrt?

  2. anonymous
    • 5 years ago
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    the -3x+6.

  3. anonymous
    • 5 years ago
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    okay

  4. Mertsj
    • 5 years ago
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    |dw:1326859234891:dw|

  5. Mertsj
    • 5 years ago
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    x=-10 x=-1

  6. anonymous
    • 5 years ago
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    x = -10, -1

  7. anonymous
    • 5 years ago
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    dang it you beat me!

  8. Mertsj
    • 5 years ago
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    But -10 does not check so discard it.

  9. anonymous
    • 5 years ago
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    its extraneous

  10. anonymous
    • 5 years ago
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    what do you mean by "not checking"

  11. Mertsj
    • 5 years ago
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    so the only answer is -1

  12. Mertsj
    • 5 years ago
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    If you put it back in the original equation, it does not make a true sentence.

  13. Mertsj
    • 5 years ago
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    |dw:1326859474196:dw|

  14. anonymous
    • 5 years ago
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    ahhh... so i know on the2nd to 3rd step you skipped the math involved.. i get -3x=x^2+8x+10 am i correct?

  15. anonymous
    • 5 years ago
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    well, would you count it or not because you could do -6,6 = -10+4, one of those is true

  16. anonymous
    • 5 years ago
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    oh i see.

  17. anonymous
    • 5 years ago
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    |dw:1326859540983:dw|

  18. anonymous
    • 5 years ago
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    fail

  19. Mertsj
    • 5 years ago
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    Yes Luci, you are correct

  20. Mertsj
    • 5 years ago
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    mridrik watch

  21. anonymous
    • 5 years ago
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    so you divide it all by -3... right? to get x alone?

  22. anonymous
    • 5 years ago
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    but sqrt(36) also = 6, and -10 + 4 is -6, so - 6 = -6 but 6 ~= -6

  23. Mertsj
    • 5 years ago
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    |dw:1326859647986:dw|

  24. anonymous
    • 5 years ago
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    only use principle square root in this case?

  25. anonymous
    • 5 years ago
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    whoops nevermind... blonde moment. ://

  26. anonymous
    • 5 years ago
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    hey, i am blonde, watch it

  27. Mertsj
    • 5 years ago
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    Luci, subtract 3x from both sides.

  28. Mertsj
    • 5 years ago
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    mridrik, did you look at the drawing I made? The square root symbol means the POSITIVE root

  29. anonymous
    • 5 years ago
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    Mertsj... yeah, lol i barely saw that :/ and mridrik.. im blonde too so it's okay:)

  30. anonymous
    • 5 years ago
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    But why wouldnt you also accept the - root? -6^2 is also 36

  31. Mertsj
    • 5 years ago
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    (squaredrootof)-3x+6

  32. anonymous
    • 5 years ago
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    yeah only blondes can make fun of blondes

  33. Mertsj
    • 5 years ago
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    Is that not the original problem? Do you see anything there about the negative root?

  34. anonymous
    • 5 years ago
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    the original problem says sqrt(-3x+6) = x + 4, if x is negative ten, then sqrt(36) = x + 4, the square root of 36 is positive and negative 6, I'm just wondering why you dont use the negative six, I understand some problems just mean the principle square root, but how do i know when it means that?

  35. anonymous
    • 5 years ago
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    that's a good question... i don't know?

  36. Mertsj
    • 5 years ago
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    The answer is no

  37. Mertsj
    • 5 years ago
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    Here is the original problem

  38. Mertsj
    • 5 years ago
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    |dw:1326860480067:dw|

  39. anonymous
    • 5 years ago
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    yes.

  40. Mertsj
    • 5 years ago
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    It does NOT say this:

  41. Mertsj
    • 5 years ago
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    |dw:1326860542618:dw|

  42. Mertsj
    • 5 years ago
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    Therefore it is ONLY the POSITIVE root

  43. anonymous
    • 5 years ago
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    oooooohhhhhh... awesomee:)

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