Question 1173138
--------------------------------------------------
Solve the quadratic equation by completing the square.

x^2+6x+7=0
--------------------------------------------------




{{{x^2+bx+c=0}}}

{{{x^2+bx=-c}}}

{{{x^2+bx+(b/2)^2=(b/2)^2-c}}}

{{{(x+b/2)^2=(b^2/4)-c}}}

{{{(x+b/2)^2=(b^2/4)-4c/4}}}

{{{(x+b/2)^2=(b^2-4c)/4}}}

{{{x+b/2=0+- sqrt(b^2-4c)/2}}}

.

.