Exercise · ZW-FUNCTION-OF-SEVERAL-VARIABLES-003 · ★☆☆ Basic
What is the domain of \(f(x,y)=\sqrt{4-x^2-y^2}\)?
Choose one option.
Show answer
- B. The disk \(x^2+y^2\le4\)
Explanation
The root requires \(4-x^2-y^2\ge0\), that is \(x^2+y^2\le4\): the closed disk of radius \(2\).
Review the concept: Function of several variables
A function of several variables \(f\) assigns to each point \(\mathbf x=(x_1,\dots,x_n)\) of a set \(D\subseteq\mathbb R^n\), its domain, a single real number.
\[f:D\subseteq\mathbb R^n\to\mathbb R\]
More practice problems: function of several variables
- ZW-FUNCTION-OF-SEVERAL-VARIABLES-001 If f(x,y)=x^2+3y, compute f(2,1).
- ZW-FUNCTION-OF-SEVERAL-VARIABLES-002 If f(x,y,z)=xyz-z, compute f(1,2,3).
- ZW-FUNCTION-OF-SEVERAL-VARIABLES-004 Find the domain of f(x,y)=ln (x-y).
- ZW-FUNCTION-OF-SEVERAL-VARIABLES-005 What is the range of f(x,y)=x^2+y^2?
- ZW-FUNCTION-OF-SEVERAL-VARIABLES-006 Which points belong to the domain of f(x,y)=(1)/(x^2+y^2-1)?
- ZW-FUNCTION-OF-SEVERAL-VARIABLES-007 The graph of a function f(x,y) of two variables is a subset of:
- ZW-FUNCTION-OF-SEVERAL-VARIABLES-008 If f(x,y)=x^2y, what is (f(2x,2y))/(f(x,y)) when f(x,y)ne0?
- ZW-FUNCTION-OF-SEVERAL-VARIABLES-009 What is the domain of f(x,y)=√ x+ln y?
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