Originally Posted by
fitzgilbert Determine the stationary points of the function
f(x,y)=(x^2+(1/2)xy+y^2)e^(x+y)
after differentiating i get
df/dx = x^2 + 2x +(1/2)xy + (1/2)y +y^2 = 0 ...eq1
and
df/dy = y^2 + (1/2)x +(1/2)xy + 2y + y^2 = 0 ...eq2 Mr F says: This is wrong. The term in red should be x^2. Is it a typo or were you using it when attempting the calculations?
i then solved these 2 eqs simultanously and got
y= (-4/3)x^2 - x
which i subed back into eq 1 which turnrf into a unholy mess
can anyone please help me...where am i going wrong?