SOLUTION: f(x)=x^2+4x-45 Does the graph of f open up or down. What is the vertex (h,k) of f What is the axis of symmetry What are the intercepts

Algebra ->  Rational-functions -> SOLUTION: f(x)=x^2+4x-45 Does the graph of f open up or down. What is the vertex (h,k) of f What is the axis of symmetry What are the intercepts      Log On


   

Question 238486: f(x)=x^2+4x-45
Does the graph of f open up or down.
What is the vertex (h,k) of f
What is the axis of symmetry
What are the intercepts
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.Opens up, controlled by the sign of x%5E2 coefficient, +up, -down
2.x coordinate of the vertex is x=-b%2F2a
x=-4/2(1)=-2
y=(-2)^2+4(-2)-45=-49
(-2,-49)
3. Axis of symmetry is the x-position of the vertex, x=-2.