Question 259996
f(x)=3x^2-7x-13
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
x=(7+-sqrt[-7^2-4*3*-13])/2*3
x=(7+-sqrt49+156])/6
x=(7+-sqrt205)/6
x=(7+-14.32)/6
x=(7+14.32)/6
x=21.32/6
x=3.55 ans.
x=(7-14.32)/6
x=-7.32/6
x=-1.22 ans.
{{{ graph( 300, 200, -6, 5, -18, 10, 3x^2 -7x -13) }}} (graph 300x200 pixels, x from -6 to 5, y from -18 to 10, 3x^2 -7x -13). 
[The 2 x intercepts are (-1.22,0) & (3.55,0)]