document.write( "Question 269872: Solve the equation 3x^3+7x^2-22x-8=0 given that (-1/3) is a root \n" ); document.write( "
Algebra.Com's Answer #197722 by drk(1908)![]() ![]() ![]() You can put this solution on YOUR website! We can use synthetic division. It is easier than polynomial.\r \n" ); document.write( "\n" ); document.write( "(-1/3)// . . . . . . 3 . . . . . . 7 . . . . . . . -22 . . . . . . . .-8 \n" ); document.write( " . . . . . . . . . . . . . . . . . . . .-1. . . . . . . .-2. . . . . . . . 8 \n" ); document.write( " . . . . . . . . . . . . .3. . . . . . .6 . . . . . . . .-24 . . . . . . . .0 \n" ); document.write( "we now must factor 3x^2 + 6x - 24 as (3x - 6)(x + 4) \n" ); document.write( "set this equal to zero and we get \n" ); document.write( "x = 2 \n" ); document.write( "or \n" ); document.write( "x = -4 \n" ); document.write( "----- \n" ); document.write( "So our roots are: {-4, -1/3, 2) \n" ); document.write( " |