document.write( "Question 1178838: 2 (| 4-3x |) -3 (| 2x+1 |) < 7\r
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document.write( "I'm studying for a test and trying to solve this. I always reach the answer 4/3 > x >-1/6 but according to my teacher, the correct answer is x> -1/6 and I keep on going wrong somewhere but can't find where. Help is very much appreciated. Thanks! \n" );
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Algebra.Com's Answer #808260 by greenestamps(13200)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "We can only guess what you are doing wrong, because you only show us what your wrong answer is, without showing HOW you got your answer. \n" ); document.write( "The two critical points for the expression are where the expressions within the absolute value symbols are equal to zero -- at 4/3 and -1/2. So to solve the inequality you need to examine three cases: (1) x less than-1/2; (2) x between -1/2 and 4/3; and (3) x greater than 4/3. \n" ); document.write( "Solving the first case leads to the equation 11<7, which is never true. So there are no solutions for x<-1/2. \n" ); document.write( "Solving the second case leads to your answer of [-1/6,4/3). \n" ); document.write( "Perhaps you stopped there in your work.... \n" ); document.write( "Solving the third case leads to the equation -11<7, which is always true. So all values greater than or equal to 4/3 are also solutions. \n" ); document.write( "That gives what your teacher says is the correct answer. \n" ); document.write( " \n" ); document.write( " |