SOLUTION: Solve the equation by completing the square: (k-1)(k+7)=9

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Solve the equation by completing the square: (k-1)(k+7)=9      Log On


   

Question 800930: Solve the equation by completing the square: (k-1)(k+7)=9
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
(k-1)(k+7)=9
k%5E2%2B6x-7=9

k%5E2%2B6x=9%2B7

k%5E2%2B6x%2B9=9%2B7%2B9

%28k%2B3%29%5E2=25

take the square root
(x+3)=+/- 5
x=-3+5=2
OR
x=-3-5=-8
x=2OR -8