Ali must mix 6 tablespoons of plant food for every 2 gallons of water if she has 6 gallons of water how much plant food should she use

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