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anonymous

  • 4 years ago

please help problem is on attachment

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  1. anonymous
    • 4 years ago
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  2. anonymous
    • 4 years ago
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    no solution since the y-value of a square root function must be positive

  3. Mertsj
    • 4 years ago
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    \[-5\sqrt{x-9}-7=23\]

  4. Mertsj
    • 4 years ago
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    \[-5\sqrt{x-9}=30\]

  5. Mertsj
    • 4 years ago
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    \[\sqrt{x-9}=-6\]

  6. Mertsj
    • 4 years ago
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    The positive square root of a number cannot be negative. So just like moneybird said.

  7. anonymous
    • 4 years ago
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    Couldnt it x be 27?

  8. Mertsj
    • 4 years ago
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    \[-5\sqrt{27-9}-7=23\]

  9. Mertsj
    • 4 years ago
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    Is that s true sentence?

  10. anonymous
    • 4 years ago
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    Oops, i mean 45

  11. Mertsj
    • 4 years ago
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    \[-5\sqrt{45-9}-7=23\]

  12. anonymous
    • 4 years ago
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    since the square root of 36 is 6 and -6

  13. Mertsj
    • 4 years ago
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    Is that true?

  14. anonymous
    • 4 years ago
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    yes

  15. Mertsj
    • 4 years ago
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    But the symbol indicates the POSITIVE root of 36

  16. anonymous
    • 4 years ago
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    what symbol?

  17. Mertsj
    • 4 years ago
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    |dw:1327710340814:dw|

  18. anonymous
    • 4 years ago
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    how do you know it means principle square root?

  19. Mertsj
    • 4 years ago
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    Because it does not say +/-

  20. anonymous
    • 4 years ago
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    oh, okay, that makes sense, thanks

  21. Mertsj
    • 4 years ago
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    What does "3" mean? Positive 3 or negative 3 or both?

  22. anonymous
    • 4 years ago
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    I don't think that is related... I'm just saying that -6^2 and 6^2 both equal 36

  23. Mertsj
    • 4 years ago
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    It is related. the symbol does not indicate a sign so it is understood to be the positive root.

  24. Mertsj
    • 4 years ago
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    and also -6^2=-36 wheras (-6)^2=36

  25. anonymous
    • 4 years ago
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    Oh wow, you are right, I immediately understood it to be positive, nice job. And you know i meant (-6)

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