document.write( "Question 936117: You can model the population of a certain city between 1955 and 2000 by the radical function P(x) = 55000*sqrt(x) - 1944. On which year was the population of the city 220,000? \n" ); document.write( "

Algebra.Com's Answer #569559 by TimothyLamb(4379) $\"\"$ $\"About$

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55000*sqrt(x) - 1944 = 220000
\n" ); document.write( "55000*sqrt(x) = 220000 + 1944
\n" ); document.write( "sqrt(x) = (220000 + 1944)/55000
\n" ); document.write( "(sqrt(x))^2 = ( (220000 + 1944)/55000 )^2
\n" ); document.write( "x = ( (220000 + 1944)/55000 )^2
\n" ); document.write( "x = 16.2840129375
\n" ); document.write( "--
\n" ); document.write( "check:
\n" ); document.write( "55000*sqrt(16.2840129375) - 1944 = 220000
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "year = 1955 + 16.2840129375
\n" ); document.write( "year = 1971
\n" ); document.write( "---
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