Answer:
The trestle meets ground level at 0.875 units and 9.125 units
Step-by-step explanation:
Poorly formatted question.
The given equation is:

Required
The point where the trestle gets to the ground level
To do this, we set 
So, we have:

Multiply through by -1

Solve using quadratic formula:

Where:

So, we have:




Solve the fraction

Split


here's your solution,
A (5, 4) and B (5,-2) = 6 units
E (-2,-1) and F (-2,-5) = 4 units
C (-4,1) and D (1,1) = 5 units
G (3,-5) and H (6,-5) = 3 units