angelwings996
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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Jonask
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\[275000=55000\sqrt{x-1945}\]
calc x
angelwings996
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Would I subtract 55000 from 275,000?
Jonask
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no divide both sides by 55000
Goten77
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|dw:1357766515232:dw|
chphiranya
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Do u know the 'BODMAS' concept ?
angelwings996
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so \[5 = \sqrt{x-1945}\]
angelwings996
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No, I only know PEMDAS
chphiranya
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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
angelwings996
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Okay, but if there is a square root sign, like this one, then how do I know what to do?
Goten77
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square each side now
angelwings996
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\[5^{2} = (x-1945)^{2}\] right ?
angelwings996
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so
\[25 = x - 1945 ?\]
Goten77
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no... squaring the ride side gets rid of the square root
Goten77
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well yes 25=x-1945
*u had it written different 1 comment b4*
angelwings996
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Oh sorry, then would I add 1945 to 25 and then it will give me x ?
angelwings996
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So x = 1970 ? so the answer would be A ?
Goten77
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yes
angelwings996
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Okay thanks for your help! (: