document.write( "Question 780512: 5-x^2
\n" ); document.write( "How do I know what the range is? I thought it would be [5, - infinity) but I think I'm wrong. \n" ); document.write( "
Algebra.Com's Answer #475656 by lwsshak3(11628)\"\" \"About 
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5-x^2
\n" ); document.write( "How do I know what the range is?
\n" ); document.write( "***
\n" ); document.write( "y=5-x^2
\n" ); document.write( "solve for x in terms of y
\n" ); document.write( "x^2=5-y
\n" ); document.write( "x=±√(5-y)
\n" ); document.write( "5-y≥0
\n" ); document.write( "-y≥-5
\n" ); document.write( "y≤5
\n" ); document.write( "Range: (-∞,5] \n" ); document.write( "
\n" );