document.write( "Question 1003837: write an equation of the parabola that passes through the point (3,-30) and has x-intercepts -2 and 18. \n" ); document.write( "
Algebra.Com's Answer #620450 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
write an equation of the parabola that passes through the point (3,-30) and has x-intercepts -2 and 18.
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document.write( "\"x=-2\", \"x=18\"\r\n" );
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document.write( "\"x%2B2=0\",  \"x-18=0\"\r\n" );
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document.write( "\"y+=+a%28x%2B2%29%28x-18%29\"\r\n" );
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document.write( "\"y+=+a%28x%5E2-16x-36%29\"\r\n" );
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document.write( "Substitute (x,y) = (3,-30)\r\n" );
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document.write( "\"-30+=+a%283%5E2-16%2A3-36%29\"\r\n" );
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document.write( "\"-30+=+a%289-48-36%29\"\r\n" );
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document.write( "\"-30+=+a%28-75%29\"\r\n" );
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document.write( "\"%28-30%29%2F%28-75%29=a\"\r\n" );
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document.write( "\"2%2F5=a\"\r\n" );
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document.write( "So the equation \r\n" );
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document.write( "\"y+=+a%28x%5E2-16x-36%29\"\r\n" );
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document.write( "becomes:\r\n" );
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document.write( "\"y+=+expr%282%2F5%29%28x%5E2-16x-36%29\"\r\n" );
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document.write( "\"y+=+expr%282%2F5%29x%5E2-expr%2832%2F5%29x-expr%2872%2F5%29%29\"\r\n" );
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document.write( "Edwin
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