SOLUTION: Find the x-intercepts y=x^2+4x-1

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Find the x-intercepts y=x^2+4x-1       Log On


   

Question 155981: Find the x-intercepts
y=x^2+4x-1
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
y=x^2+4x-1
+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+x%5E2+%2B4x+%2B1%29+ (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, x^2 +4x +1).
Using the quadratic equation x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ we get:
x=0.236 & -4.236