document.write( "Question 806652: solve the quadratic inequality. Write the solution set in interval notation. x^2-3x-18<0 \n" ); document.write( "
Algebra.Com's Answer #485948 by Edwin McCravy(20054)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "  x² - 3x - 18 < 0\r\n" );
document.write( "(x - 6)(x + 3) < 0\r\n" );
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document.write( "The critical numbers are 6 and -3\r\n" );
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document.write( "-------o--------------------------o------\r\n" );
document.write( "-5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8\r\n" );
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document.write( "test value -4:  (-4)² - 3(-4) - 18 < 0\r\n" );
document.write( "                      16 + 12 - 18 < 0\r\n" );
document.write( "                                10 < 0\r\n" );
document.write( "False do not shade (-infinity,-3)\r\n" );
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document.write( "test value 0:  (0)² - 3(0) - 18 < 0\r\n" );
document.write( "                     0 + 0 - 18 < 0\r\n" );
document.write( "                            -18 < 0\r\n" );
document.write( "True, so shade (-3,6)\r\n" );
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document.write( "-------o==========================o------\r\n" );
document.write( "-5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8\r\n" );
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document.write( "test value 7:  (7)² - 3(7) - 18 < 0\r\n" );
document.write( "                    49 -21 - 18 < 0\r\n" );
document.write( "                             10 < 0\r\n" );
document.write( "False do not shade (6, infinity)\r\n" );
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document.write( "-------o==========================o------\r\n" );
document.write( "-5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8\r\n" );
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document.write( "Answer (-3,6)\r\n" );
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document.write( "Edwin
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