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
What is the domain of f
What is the ran
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Question 238497: 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
What is the domain of f
What is the range of f
on what interval f is decreasing
On what interval f is increasing
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
\ =\ x^2\ +\ 4x\ -\ 45)
is a parabola of the form
The lead coefficient is positive so the parabola opens upward.
The 
-coordinate of the vertex is given by 
Then obviously the 
-coordinate of the vertex must be )
The axis of symmetry is the vertical line 
The -intercepts, if any exist, are the values of that satisfy \ =\ 0)
The -intercept is found by evaluating )
The domain of any polynomial function is all real numbers. The range of a quadratic polynomial in the form
that opens upward is \})
A parabola that opens upward is increasing to the right of the vertex, that is to say the interval [
)
Quite obviously the decreasing interval is (
]
John
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