document.write( "Question 969032: WHEN y=ax^2+bx+c>0, can u tell me why the graph must be above the x-axis? \n" ); document.write( "

Algebra.Com's Answer #592051 by Edwin McCravy(20055) $\"\"$ $\"About$

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WHEN y=ax^2+bx+c>0, can u tell me why the graph must be above the x-axis?
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document.write( "Look at this set of axes:\r\n" );
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document.write( "All the numbers marked on the y-axis above the x-axis are all positive.\r\n" );
document.write( "All the numbers marked on the y-axis below the x-axis are all negative.\r\n" );
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document.write( "The positive numbers are the numbers greater than 0.\r\n" );
document.write( "The negative numbers are the numbers less than 0.\r\n" );
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document.write( "Your inequality states:\r\n" );
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document.write( "y = ax^2+bx+c > 0\r\n" );
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document.write( "The important thing is that it says that y > 0,\r\n" );
document.write( "or y is greater than 0, which means that y is positive.\r\n" );
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document.write( "So that can only be where the y-axis has positive numbers \r\n" );
document.write( "marked on it, which is above the x-axis.\r\n" );
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document.write( "Edwin

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