A Nice Functional Equation [f(x+y)=f(x)+f(y)+2xy]
10:11
Solving a Non-Standard Radical Equation
9:11
A Nonstandard Equation With Exponentials
11:13
A fun functional equation!!
9:14
Solving f(x+y)=f(x)+f(y)+2xy in Two Ways
9:38
A Nice Quartic Equation
16:52
A deceivingly difficult differential equation
9:00
Solving a Suggested Functional Equation
9:24