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angelwings996

  • 3 years ago

You can model the populationof a certain city between the years 1995 and 2000 by the radical function P(x) = 55000 sqrt(x - 1945). Using this model, in what year was the population of that city 275,000? a. 1970 b. 1966 c. 1964 d. 1975

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  1. Jonask
    • 3 years ago
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    \[275000=55000\sqrt{x-1945}\] calc x

  2. angelwings996
    • 3 years ago
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    Would I subtract 55000 from 275,000?

  3. Jonask
    • 3 years ago
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    no divide both sides by 55000

  4. Goten77
    • 3 years ago
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    |dw:1357766515232:dw|

  5. chphiranya
    • 3 years ago
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    Do u know the 'BODMAS' concept ?

  6. angelwings996
    • 3 years ago
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    so \[5 = \sqrt{x-1945}\]

  7. angelwings996
    • 3 years ago
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    No, I only know PEMDAS

  8. chphiranya
    • 3 years ago
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    The 'BODMAS' concept tells u the order u should follow when simplifying. The order is from top to bottom. B= Brackets ( ) O= Of D= Divide M= Multiplication A= Addition S= Substraction

  9. angelwings996
    • 3 years ago
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    Okay, but if there is a square root sign, like this one, then how do I know what to do?

  10. Goten77
    • 3 years ago
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    square each side now

  11. angelwings996
    • 3 years ago
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    \[5^{2} = (x-1945)^{2}\] right ?

  12. angelwings996
    • 3 years ago
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    so \[25 = x - 1945 ?\]

  13. Goten77
    • 3 years ago
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    no... squaring the ride side gets rid of the square root

  14. Goten77
    • 3 years ago
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    well yes 25=x-1945 *u had it written different 1 comment b4*

  15. angelwings996
    • 3 years ago
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    Oh sorry, then would I add 1945 to 25 and then it will give me x ?

  16. angelwings996
    • 3 years ago
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    So x = 1970 ? so the answer would be A ?

  17. Goten77
    • 3 years ago
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    yes

  18. angelwings996
    • 3 years ago
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    Okay thanks for your help! (:

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