Question 668935
{{{x = (-b+-sqrt(b^2-4ac))/(2a)}}}


{{{x = (-(8)+-sqrt((8)^2-4(1)(-5)))/(2(1))}}}


{{{x = (-8+-sqrt(64-(-20)))/(2)}}}


{{{x = (-8+-sqrt(64+20))/(2)}}}


{{{x = (-8+-sqrt(84))/2}}}


{{{x = (-8+sqrt(84))/2}}} or {{{x = (-8-sqrt(84))/2}}}


{{{x = (-8+2*sqrt(21))/2}}} or {{{x = (-8-2*sqrt(21))/2}}}


{{{x = -4+sqrt(21)}}} or {{{x = -4-sqrt(21)}}}


{{{x = 0.58257569495584}}} or {{{x = -8.58257569495584}}}


{{{x = 0.583}}} or {{{x = -8.583}}}




So the exact solutions are {{{x = -4+sqrt(21)}}} or {{{x = -4-sqrt(21)}}}


and the approximate solutions (to 3 decimal places) are {{{x = 0.583}}} or {{{x = -8.583}}}