document.write( "Question 1063607: For what values of b will the straight line y=2x+b not intersect the
\n" ); document.write( "parabola y=x^2+3x-5 ?
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Algebra.Com's Answer #678723 by josgarithmetic(39618)\"\" \"About 
You can put this solution on YOUR website!
If they did intersect, you would equate the two expressions for y:\r
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\n" ); document.write( "\n" ); document.write( "\"x%5E2%2B3x-5=2x%2Bb\"
\n" ); document.write( "\"x%5E2%2B3x-2x-5-b=0\"
\n" ); document.write( "\"x%5E2%2Bx-%28b%2B5%29=0\"\r
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\n" ); document.write( "\n" ); document.write( "Since you DO NOT want the line and parabola to intersect, then you want this equation to have NO REAL SOLUTIONS, and you must have the discriminant be negative.\r
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\n" ); document.write( "\n" ); document.write( "\"1%5E2-4%2A1%2A%28-1%28b%2B5%29%29%3C0\"\r
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\n" ); document.write( "\n" ); document.write( "\"1%2B4%28b%2B5%29%3C0\"\r
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\n" ); document.write( "\n" ); document.write( "\"1%2B4b%2B20%3C0\"\r
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\n" ); document.write( "\n" ); document.write( "\"4b%3C-21\"\r
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\n" ); document.write( "\n" ); document.write( "\"highlight%28b%3C-21%2F4%29\"---------the requirement so that your given line and parabola do not intersect.
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