- #1
ZedCar
- 354
- 1
Homework Statement
A question in a book has partially differentiated a function
f(x,y) = x^2 + 8xy^2 + 2y^2
df/dx = 2x + 8y^2 = 0 at stationary point (eqn 1)
df/dy = 16xy + 4y = 0 at stationary point (eqn 2)
Homework Equations
The Attempt at a Solution
It then states;
From (eqn 2) either
y = 0, or 16x + 4 = 0
y = 0, or x = -1/4
I can understand how y=0, but how do they conclude that 16x + 4 = 0
Thank you