Question 391034
f(x)=x^2+7x+9
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
x=(-7+-sqrt[7^2-4*1*9])/2*1
x=(-7+-sqrt[49-36])/2
x=(-7+-sqrt13)/2
x=(-7+-3.6)/2
x=(-7+3.6)/2
x=-3.4/2
x=-1.7 ans.
x=(-7-3.6)/2
x=-10.6/2
x=-5.3 ans.