document.write( "Question 801049: Solve the equation by completing the square: (k-1)(k+7)=9 \n" ); document.write( "
Algebra.Com's Answer #483419 by rothauserc(4718)\"\" \"About 
You can put this solution on YOUR website!
(k-1)(k+7)=9
\n" ); document.write( "k^2 +6k -7 = 9
\n" ); document.write( "add 7 to both sides of =
\n" ); document.write( "k^2 +6k = 16
\n" ); document.write( "divide coefficient of k by 2, 6/2 = 3 and 3^2 = 9
\n" ); document.write( "k^2 +6k +9 = 16 +9
\n" ); document.write( "(k+3)^2 = 25
\n" ); document.write( "take square root of both sides of =
\n" ); document.write( "k+3 = square root of 25
\n" ); document.write( "k = 5 - 3 = 2
\n" ); document.write( "k = -5 - 3 = -8
\n" ); document.write( " \n" ); document.write( "
\n" );