Question 810374
use the quadratic equation
a=-16
b=-28
c=250
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
{{{x = (-(-28) +- sqrt( (-28)^2-4*(-16)*250 ))/(2*(-16)) }}}
{{{x = (28 +- sqrt( 784+16000))/(-32)}}}
{{{x = (28 +- 4sqrt( 1049))/(-32)}}}
{{{x = (7 +- sqrt( 1049))/(-8)}}}