SOLUTION: I need help with this! Thanks so much! apply the quadratic formula to find the roots of the given function, and then graph the function. f(x) = x^2 - 4

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: I need help with this! Thanks so much! apply the quadratic formula to find the roots of the given function, and then graph the function. f(x) = x^2 - 4      Log On


   

Question 36105: I need help with this! Thanks so much!
apply the quadratic formula to find the roots of the given function, and then graph the function.
f(x) = x^2 - 4
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
Again, why would you want to use the quadratic formula?? This one ALSO factors:
f%28x%29+=+x%5E2+-+4
f%28x%29+=+%28x-2%29%2A%28x%2B2%29=0
->-> x=+2 or x=+-2

Graphing looks like this:

graph+%28300%2C+300%2C+-4%2C+4%2C+-6%2C6%2C+x%5E2+-4%29
The roots are at x = -2 and x = 2

R^2 at SCC