SOLUTION: Use the quadratic formula to determine the x-intercepts (if any) of the following function. Then evaluate the function for several values of x, and use the resulting points to grap

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Use the quadratic formula to determine the x-intercepts (if any) of the following function. Then evaluate the function for several values of x, and use the resulting points to grap      Log On


   

Question 311854: Use the quadratic formula to determine the x-intercepts (if any) of the following function. Then evaluate the function for several values of x, and use the resulting points to graph the function. Show your work
f (x) = - x^2 + 2x - 1
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
f (x) = - x^2 + 2x - 1
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
X=(-2+-SQRT[2^2-4*-1*-1])/2*-1
X=(-2+-SQRT[4-4])/-2
X=(-2+-SQRT0)/-2
X=-2/-2=1 ANS.
F(2)=-2^2+2*2-1
F(2)=4+4-1
F(2)=7 ANS
F(7)=-7^2+2*7-1
F(7)=-49+14-1
F(7)=-50+14
F(7)=-36 ANS.
+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C++-x%5E2+%2B2x+-1%29+ (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, -x^2 +2x -1).