document.write( "Question 585207: If x^2 = 6x-9 , then what value is 5x^2+x-8 ? The hint is to solve for x first. \n" ); document.write( "
Algebra.Com's Answer #373240 by sofiyac(983)![]() ![]() You can put this solution on YOUR website! If x^2 = 6x-9 , then what value is 5x^2+x-8 ? The hint is to solve for x first. \n" ); document.write( "5(6x-9)+x-8=5x^2+x-8\r \n" ); document.write( "\n" ); document.write( "5(6x-9)=5x^2\r \n" ); document.write( "\n" ); document.write( "6x-9=x^2\r \n" ); document.write( "\n" ); document.write( "x^2-6x+9=0 \n" ); document.write( "(x-3)(x-3)=0 \n" ); document.write( "so x=3\r \n" ); document.write( "\n" ); document.write( "5x^2+x-8=5*9+3-8=45-5=40 The answer is 40 \n" ); document.write( " |