Question 46403
Use the quadratic formula where:
a=1
b=18
c=63
.

{{{x = (-18 +- sqrt( 18^2-4*1*63 ))/(2*1) }}}[Plug-in the values and solve]
{{{x = (-18 +- sqrt( 324-252 ))/(2) }}} [Combine terms and simplify]
{{{x = (-18 +- sqrt( 72 ))/(2) }}}[Factoring 72 = 2*4*9]
{{{x = (-18 +- 6sqrt(2)) /(2) }}} 
{{{x = 2(-9 +- 3sqrt(2))/( 2) }}} [Factor out "2"]
{{{x = (-9 +- 3sqrt(2)))}}} [Cancel out "2"]
{{{x = (-9 +- 3sqrt(2))}}}
x=-13.2426 or x = -4.7573