View attachment 37732
This question is very insidious in that it looks easy but is somewhat difficult (or at least difficult to start off on). How do I solve it?
Question is extremely easy. Basic substitution.
You need first find an expression for area. Hint introduce another variable "l".
Formulate the constraint, using x and "l".
Using substitution eliminate "l" in the formula for area by making it the subject in the constraint.
This gives area A.
b/c involves parabolas so are easy.
