document.write( "Question 1208157: Find the range with algebra (no graphing) of f(x)/g(x) if \r
\n" ); document.write( "\n" ); document.write( "f(x) = sqrt{4 - x^2}\r
\n" ); document.write( "\n" ); document.write( "g(x) = sqrt{9 - x^2}
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Algebra.Com's Answer #846377 by greenestamps(13200)\"\" \"About 
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\n" ); document.write( "\"sqrt%284-x%5E2%29%2Fsqrt%289-x%5E2%29\"

\n" ); document.write( "Use the property \"sqrt%28A%29%2Fsqrt%28B%29=sqrt%28A%2FB%29\" (for A and B positive):

\n" ); document.write( "\"sqrt%28%284-x%5E2%29%2F%289-x%5E2%29%29\"

\n" ); document.write( "Rewrite the radicand:

\n" ); document.write( "\"sqrt%28%28%289-x%5E2%29-5%29%2F%289-x%5E2%29%29\"

\n" ); document.write( "\"sqrt%281-5%2F%289-x%5E2%29%29\"

\n" ); document.write( "This expression is the square root of something less than 1.

\n" ); document.write( "Its minimum value is 0, when the radicand is zero:

\n" ); document.write( "\"1-5%2F%289-x%5E2%29=0\"
\n" ); document.write( "\"5%2F%289-x%5E2%29=1\"
\n" ); document.write( "\"9-x%5E2=5\"
\n" ); document.write( "\"x%5E2=4\"

\n" ); document.write( "The lower end of the range of the given function is 0, when x is 2 or -2.

\n" ); document.write( "The maximum value of the radicand is when \"5%2F%289-x%5E2%29\" is a minimum -- i.e., when the smallest possible value is subtracted from 1. That is when x is 0; the upper end of the range of the given function is

\n" ); document.write( "\"sqrt%281-%285%2F%289-0%29%29%29=sqrt%281-5%2F9%29=sqrt%284%2F9%29=2%2F3\"

\n" ); document.write( "ANSWER: the range of the given function is [0,2/3]

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