Jim has 19{,}700\text { g}19,700 g19, comma, 700, start text, space, g, end text of sand in his sandbox. He brings home another 6{,}300\text { g}6,300 g6, comma, 300, start text, space, g, end text of sand from the beach to add to his sandbox

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