Local maximum, minimum and saddle points Quiz
10 questions · easy to harder · Calculus 3 · score and step-by-step answers
How it works
- 10 questions, about 30 minutes (a timer counts down; you can hide it). Solve it right here: no sign-up.
- 0 questions have choices. For the others you type the answer: a number like 4, −2, 7/2 or 3.5, or for example x = 4, x = 2 or x = −3, (3, 5), 2x + 1. Use ^ for powers (x^2) and sqrt for √. Any form with the same value counts (7/2 = 3.5).
- One question at a time: Back, Next, Mark for review and the question list at the bottom. A calculator is on the screen.
- At the end: your percent and grade, every question right or wrong, why a wrong choice is wrong, and its step-by-step solution. Then practise the lesson with new questions.
Your answers and results are kept in this browser only, so you can close the page and come back.
1 Question 1
Local max and min of f(x, y) = x2 + y2 − 4x + 6yType the answer.
2 Question 2
Local max and min of f(x, y) = 4 − x2 − y2Type the answer.
3 Question 3
Local max and min of f(x, y) = 2x2 + y2 − 8xType the answer.
4 Question 4
Local max and min of f(x, y) = x2 + 3y2 − 6x + 6yType the answer.
5 Question 5
Critical points of f(x, y) = x2 + 4xy + y2Type the answer.
6 Question 6
Critical points of f(x, y) = xyType the answer.
7 Question 7
Classify the critical points of f(x, y) = x2 + xy + y2 − 6yType the answer.
8 Question 8
Critical points of f(x, y) = y3 − 3y + x2Type the answer.
9 Question 9
Critical points of f(x, y) = x3 + y3 − 3x − 12yType the answer.
10 Question 10
Classify the critical points of f(x, y) = x2 − 2xy + 3y2 − 4xType the answer.