document.write( "Question 16705: find all values for k such that the equation 3x squared - 2x + k = 0 has imaginary roots \n" ); document.write( "
Algebra.Com's Answer #8209 by xcentaur(357)![]() ![]() ![]() You can put this solution on YOUR website! 3x^2 - 2x + k = 0\r \n" ); document.write( "\n" ); document.write( "For imaginary roots, discriminant(D) must be less than zero.\r \n" ); document.write( "\n" ); document.write( "D=b^2-4ac is the discriminant.\r \n" ); document.write( "\n" ); document.write( "D= (-2)^2 -4(3)(k) \n" ); document.write( " = 4 - 12k \n" ); document.write( "This must be less than zero.\r \n" ); document.write( "\n" ); document.write( "Therefore, 4 - 12k < 0 \n" ); document.write( "4<12k \n" ); document.write( "1<3k \n" ); document.write( "1/3 \n" ); document.write( "\n" ); document.write( " For k=1/3,roots will be real and equal. All values of k greater than 1/3 will result in real distinct roots.\r Hope this helps, |