document.write( "Question 1207018: If x is equal to 2km what would 4x^2-1 equal
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Algebra.Com's Answer #844817 by math_tutor2020(3817)\"\" \"About 
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\n" ); document.write( "If km refers to kilometers, then,
\n" ); document.write( "x = 2
\n" ); document.write( "4x^2-1 = 4(2)^2-1
\n" ); document.write( "= 4*(4)-1
\n" ); document.write( "= 16-1
\n" ); document.write( "= 15\r
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\n" ); document.write( "\n" ); document.write( "Summary:
\n" ); document.write( "x = 2 kilometers leads to 4x^2-1 = 15 kilometers\r
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\n" ); document.write( "\n" ); document.write( "If km in 2km doesn't refer to kilometers, and instead the k and m are separate variables, then:
\n" ); document.write( "x = 2km
\n" ); document.write( "4x^2-1 = 4(2km)^2-1
\n" ); document.write( "= 4(2^2k^2m^2)-1
\n" ); document.write( "= 4(4k^2m^2)-1
\n" ); document.write( "= 16k^2m^2-1\r
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\n" ); document.write( "\n" ); document.write( "Summary:
\n" ); document.write( "x = 2km leads to 4x^2-1 = 16k^2m^2-1
\n" ); document.write( "if the \"km\" doesn't refer to kilometers but instead two different variables.
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