You are building a rectangular dog pen with the length is twice as long as the width. You have 120 feet of fencing what are the dimensions of the dog pen?

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis