A 5 m ladder leans against a wall with a 1 m x 1 m crate between the ladder and the wall. a is the distance from the bottom of the wall to the base of the ladder where it is touching the ground. b is the distance from the bottom of the wall to the point the ladder is touching the wall.
From the previous parts of the question, I've got the following answers:
a + b = ab
From all the formulas I've found out, how do I find the maximum value of b?
The answer's 4.84.
I've tried using differentiating and then equating it to 0 like similar questions but it doesn't seem to work...