document.write( "Question 515065: Can you please Help me with this problem: Fine the soulution set for the inequality.
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document.write( "-15x + 21 <(absolute value) -3(4x + 1) \n" );
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Algebra.Com's Answer #343689 by stanbon(75887) ![]() You can put this solution on YOUR website! Fine the soulution set for the inequality. \n" ); document.write( "-15x + 21 <(absolute value) -3(4x + 1) \n" ); document.write( "----------------- \n" ); document.write( "-15x + 21 < |-3(4x+1)| \n" ); document.write( "---- \n" ); document.write( "Note: The -3(4x+1) could be positive, zero, or it could be negative. \n" ); document.write( "----- \n" ); document.write( "It is positive if (4x+1)<0 , i.e. x < -1/4 \n" ); document.write( "---- \n" ); document.write( "Draw a Number line and plot x = -1/4, \n" ); document.write( "--- \n" ); document.write( "Now, if x < -1/4, the equation becomes\r \n" ); document.write( "\n" ); document.write( "-15x + 21 < -3(4x+1) \n" ); document.write( "-15x + 21 < -12x-3 \n" ); document.write( "21 < 3x-3 \n" ); document.write( "3x > 24 \n" ); document.write( "x > 8 \n" ); document.write( "But those x's are not < -1/4. \n" ); document.write( "So there are no solutions below x = -1/4,\r \n" ); document.write( "\n" ); document.write( "----------------------- \n" ); document.write( "But, if x >= -1/4, the equation becomes\r \n" ); document.write( "\n" ); document.write( "-15x+21 < 3(4x+1) \n" ); document.write( "-15x +21 < 12x + 3 \n" ); document.write( "27x > 18 \n" ); document.write( "x > 2/3 \n" ); document.write( "================= \n" ); document.write( "Solutions: x > 2/3 \n" ); document.write( "======================== \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " \n" ); document.write( " |