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What does the symbol U mean in A U B ?
Union
Intersection
What is the domain of the function f(x)=x+3\sqrt{x+3}x+3 ?
All real numbers
x≥-3
x≥-2
What is the domain of the function f(x)=1x2−9\frac{1}{x^2-9}x2−91 ?
x≠0
x≠3
All real numbers except x=±3
Which of the following sets refers to positive integers?
{ 0,1,2,3...0,1,2,3...0,1,2,3... }
{ 1,2,3...1,2,3...1,2,3... }
{ −1,0,1...-1,0,1...−1,0,1... }
For the function k(x)=9−x2\sqrt{9-x^2}9−x2,what is its domain?
x≤3 or x≥-3
x<3 or x>-3
-3≤x≤3
What is referred to as a collection of definite objects?
Set
Equation
What does the symbol ∩ mean in A ∩ B?
What does a ∉ B mean?
a is an element of B
a is not an element of B
For the function f(x)=x2\sqrt{x^2}x2 +9,what is the domain?
x≥0
x>0
It is done.