SOLUTION: Find the x-intercepts. y = x^2 + x - 9 I am a little confused on how to find the x intercepts, I am familiar with finding they Y-intercepts but I am not understanding the x-in

Question 76018: Find the x-intercepts.
y = x^2 + x - 9
I am a little confused on how to find the x intercepts, I am familiar with finding they Y-intercepts but I am not understanding the x-intercepts. Please help. Thanks.
Answer by checkley75(3666) (Show Source): You can put this solution on YOUR website!
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 300x200 pixels, x from -6 to 5, y from -10 to 10, y = x^2 +x -9).
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