A bridge is in the form of a parabolic archway. The bridge's height (y) with respect to the horizontal distance (x) can be modeled by the quadratic function y = -0.04x2 +0.4x.
Enter the maximum height of the bridge. All measurements are in feet.

i think this could be a possible answer (1 / 84) -1

good luck! : d

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0

3

step-by-step explanation: