### 1 Answer | Add Yours

f(x)= ax^2+bx + c

f(0) = 0 ==> c = 0

f(12)= 0 ==> 144a+12b= 0==> 12a+b= 0==> b= -12a

f(6)= 6 ==> 36a+6b = 6 ==> 6a+b= 1==6a -12a=1==> -6a=1

==> a = -1/6

==> b= -12*-1/6 = 2

==> Then the equation is:

f(x)= (-1/6)x^2 +2x

Now we will assume that the trailer passes through the bridge fro the middle.

The width of the trailer is 9 .

==> Then the points where the trailer passes is between 6-4.5 and 6+4.5 ==> Then the trailer passes between x= 1.5 and x= 10.5

Now to make sure that the trailer passes under the bridge we will find the height of the parabola at the points 1.5 or 10.5

==> f(1.5)= 2.625

Then the height at the between the points 1.5 and 10.5 is 2.625

But the trailer height is given 3.2.

**Then the trailer can not fit under the bridge.**

### Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes