Lemma
Problem
Walkthrough
Solutions
1
Discuss
Easy
Gradient & optimization
#326 · Multivariable Calculus · Gradient & optimization
Saddle, peak or valley?
Classify the critical point of
f
(
x
,
y
)
=
x
2
−
y
2
at the origin.
Check my work
Enter final answer
~3 min
Answer checked instantly
Gradient & optimization
Stuck? A gentle nudge
Reveal a hint
▶ Step-by-step walkthrough
See solutions
Something off?
The answer looks wrong
The question is unclear
Information or a figure is missing
The solution needs review
Workspace
Write
Preview
Sketch
Your answer
Local minimum
Local maximum
Saddle point
Show your working
Scratch space, a sketch pad, and a full check of handwritten or typed solutions
See solutions
Sign in to share