Question 751432
Use the quadratic formula to solve for r


{{{r = (-b+-sqrt(b^2-4ac))/(2a)}}}


{{{r = (-(-3)+-sqrt((-3)^2-4(2)(-1)))/(2(2))}}} Plug in {{{a = 2}}}, {{{b = -3}}}, {{{c = -1}}}


{{{r = (3+-sqrt(9-(-8)))/(4)}}}


{{{r = (3+-sqrt(9+8))/(4)}}}


{{{r = (3+-sqrt(17))/4}}}


Exact Solutions: {{{r = (3+sqrt(17))/4}}} or {{{r = (3-sqrt(17))/4}}}


Approximate Solutions: {{{r = 1.780776}}} or {{{r = -0.280776}}}