document.write( "Question 1196593: 4x^2+5x-9 over x^2-x - 6 ≥ 0
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Algebra.Com's Answer #829494 by greenestamps(13200)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "*** Revised to correct silly arithmetic error....*** \n" ); document.write( "To find where the inequality is satisfied, we need to determine the values of x where the sign of the function changes; that can happen only at values of x for which the numerator and/or denominator is 0. \n" ); document.write( "So factor the numerator and denominator to identify those values of x. \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "The function value is 0 and changes sign when the numerator is 0 -- at x = -9/4 and x = 1. \n" ); document.write( "The function is undefined and its value changes sign when the denominator is 0 -- at x = -2 and x = 3. \n" ); document.write( "For \"large\" values of x (greater than 3), all the factors in the factored form of the function are positive, so the function value is positive. \n" ); document.write( "And the function value changes sign at x = -9/4, -2, 1, and 3. That means the function value is... \n" ); document.write( "positive for x greater than 3; \n" ); document.write( "negative for x between 1 and 3; \n" ); document.write( "positive for x between -2 and 1; \n" ); document.write( "negative for x between -9/4 and -2; and \n" ); document.write( "positive for x less than -9/4 \n" ); document.write( "Finally, remembering that the function is 0 at -9/4 and 1 and undefined at -2 and 3, the solution set to the inequality is \n" ); document.write( "(-infinity,-9/4] U (-2,1] U (3,infinity) \n" ); document.write( " \n" ); document.write( " |