document.write( "Question 1199265: Solve for x.\r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( "2x^(2/3) - 5x^(1/3) - 3 = 0\r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( "Using the Diamond Method, I got the following:\r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( "2x^(2/3) - 6x^(1/3) + x^(1/3) - 3 = 0\r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( "I then applied factoring by group.\r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( "2x^(1/3)[x^(1/3) - 3] \r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( "Setting each factor to 0 and solving for x, I got the following \r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( "values: 0, 27\r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( "According to the textbook, x = 27 is one of the solutions.\r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( "The second value of x should be -1/8. \r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( "I did everything I could think of to find the second value of x but to no avail.\r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( "How do I find x = -1/8?\r
\n" );
document.write( "
\n" );
document.write( "\n" );
document.write( " \n" );
document.write( "
Algebra.Com's Answer #833059 by ikleyn(52790)![]() ![]() You can put this solution on YOUR website! .\r \n" ); document.write( "\n" ); document.write( "Solve for x 2x^(2/3) - 5x^(1/3) - 3 = 0 \n" ); document.write( "~~~~~~~~~~~~~~~~~\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \r\n" ); document.write( "Prepare your equation to factoring using grouping-regrouping (in the same way as you did in your post)\r\n" ); document.write( "\r\n" ); document.write( " 2x^(2/3) - 6x^(1/3) + x^(1/3) - 3 = 0\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "Now factor left side step by step\r\n" ); document.write( "\r\n" ); document.write( " 2x^(1/3)*(x^(1/3)-3) + (x^(1/3) - 3) = \r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( " (x^(1/3)-3)*(2x^(1/3)+1) = 0.\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "From this factored form you have EITHER first parentheses expression is zero, \r\n" ); document.write( "OR the second parentheses expression is zero.\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "(a) Case x^(1/3)-3 = 0.\r\n" ); document.write( "\r\n" ); document.write( " It gives x^(1/3) = 3, which implies x = 3^3 = 27.\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "(b) Case 2x^(1/3)+1 = 0.\r\n" ); document.write( "\r\n" ); document.write( " It gives 2x^(1/3) + 1 0, which implies x^(1/3) =\r \n" ); document.write( "\n" ); document.write( "Solved.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "The answers/(the solutions) are x= 27 and/or x= \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Victory (!)\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "/////////////////\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "In your post, your very first step was correct, but your factoring after that was wrong.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |