Ineed perth questions 1,2,3 and 4 and it’s very hard and i’m struggling with it and if you need to see the picture big then click on it and it will be big

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