the denominator of a rational no is greater than its numenator by 8 if the numenator is increased by 17 and denominator is decreased by 1 the no obtained is 3\2 what is the rational no

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