document.write( "Question 751183: HELP PLEASE. I have to know which is a quadratic equation. Why and why not.\r
\n" ); document.write( "\n" ); document.write( "a)y=2x+5
\n" ); document.write( "b)y=2x^3+5y^2+3
\n" ); document.write( "c)y=2x^2 +5y+3
\n" ); document.write( "d)y=2x^3+5\r
\n" ); document.write( "\n" ); document.write( "Thank you so much for your help! \n" ); document.write( "
Algebra.Com's Answer #457041 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
a)y=2x+5
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document.write( "That's a LINEAR equation, not a QUADRATIC equation because\r\n" );
document.write( "the highest power of the variable x is the first power.  \r\n" );
document.write( "That is, it has degree 1. A QUADRATIC equation must have \r\n" );
document.write( "degree 2 which means it must have 2 as its highest power of\r\n" );
document.write( "the variable x.\r\n" );
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\n" ); document.write( "b)y=2x³+5y²+3
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document.write( "That's a CUBIC equation, not a QUADRATIC equation because\r\n" );
document.write( "the highest power of the variable x is the 3rd power.  \r\n" );
document.write( "That is, it has degree 3. A QUADRATIC equation must have \r\n" );
document.write( "degree 2 which means it must have 2 as its highest power of\r\n" );
document.write( "the variable x.\r\n" );
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\n" ); document.write( "c)y=2x²+5y+3
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document.write( "That's a QUADRATIC equation, because the highest power of \r\n" );
document.write( "the variable x is the 2nd power.  It has degree 2. \r\n" );
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\n" ); document.write( "d)y=2x³+5
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document.write( "That's another CUBIC equation, not a QUADRATIC equation\r\n" );
document.write( "because the highest power of the variable x is the 3rd power.\r\n" );
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document.write( "Edwin
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