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I might be mistaken, but it looks like there isn't enough information. Based on the information provided--the diagram looks like this.

can someone explain me in words plz

a= 4 b=0?

No. f(0) = b = 4.

the answer I got is -14396

|dw:1355013328506:dw|

That can't be true, it is a bridge, that means the towers must be above AND below the road.

It's not realistic though. The arch should also be a catenary, but it's not...

now i got 4

Scarydoor, you may be right

is all the given
information

so now you want to solve for x: f(x) = x^2 -40x + 4 = 0.64. Use the quadratic formula.

I made a mistake somewhere.