Question 76018
y=x^2+x-9
set y=0 and solve for x
0=x^2+x-9
using the quadratic equation we get:
x=(-1+-sqrt[1^1-4*1*-9])/2*1
x=(1+-sqrt[1+36])/2
x=(1+-sqrt37)/2
x=(1+-6.08)/2
x=1+6.08)/2
x=7.08/2
x=3.54 answer.
x=(1-7.08)/2
x=-6.08/2
x=-3.54 answer.
{{{ graph( 300, 200, -6, 5, -10, 10, y = x^2 +x -9) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = x^2 +x -9).