Question 199235
h^2 – 9hs + 9s^2
{{{h = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
h=(9+-sqrt[-9^2-4*1*9])/2*1
h=(9+-sqrt[81-36])/2
h=(9=-sqrt45)/2
h=(9+-6.7)/2
h=(9+6.7)/2
h=15.7/2
h=7.85 ans.
h=(9-6.7)/2
h=2.3/2
h=1.15 ans.