Answer:
the vertex represents a maximum
Vertex is (4,7)
f(x)=-(x-4)^2+7
Step-by-step explanation:
Given the function ![f(x)=-x^2+8x+9](https://tex.z-dn.net/?f=f%28x%29%3D-x%5E2%2B8x%2B9)
Equation is in the form of y=ax^2+bx+c
![a=-1](https://tex.z-dn.net/?f=a%3D-1)
When 'a' is negative, then vertex is maximum
when 'a' is positive, then vertex is minimum
is negative, so the vertex represents a maximum
, factor out negative
Take out negative sign in common
Answer:
450 feet at ground level
Step-by-step explanation:
The width of the bridge at ground level will be where the function intercepts the x-axis also known as the roots or zeros of the function. They are found using the zero product property to set each factor equal to 0.
This means (x-225) = 0 and (x + 225) = 0. So x = -225, 225.
This means the width is the absolute value of |-225| + 225 since distance cannot be negative. This makes it 450 feet.
Answer:
infinite
Step-by-step explanation:
y and x can be any numbers because they're independants