What are the square roots of 36/100? −6/10 and 6/10 −3/5 and 3/5 −9/25 and 9/25 −18/50 and 18/50

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