Test funcții
Quiz
•
Mathematics
•
8th Grade
•
Practice Problem
•
Medium
Gabriela-Maria Dâncu
Used 3+ times
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15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
2
-7
2.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
Answer explanation
The domain of the function is {-2, -1, 0} because these are the only input values defined in the function f(x)=x+1.
3.
MULTIPLE CHOICE QUESTION
20 sec • 5 pts
Answer explanation
The codomain of the function is the set of all real numbers, denoted by R, as the function maps elements from the domain [3;+∞) to real numbers.
4.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
Answer explanation
The correct answer is {1;4;7} because when we substitute the given values {-2, 1, 4} into the function f(x) = x + 3, we get {1;4;7} as the output.
5.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
Dintre diagramele următoare, cea în care este definită o funcție este:
A
B
C
Answer explanation
The correct choice is C because it is the only diagram where a function is defined, indicated by the mapping of input values to output values.
6.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
- 49
21
-21
49
Answer explanation
To find f(-2), substitute x=-2 into the function f(x)=x+5. Therefore, f(-2)=-2+5=-3. Hence, the correct answer is -3.
7.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Answer explanation
The point D(-1,1) belongs to the graph of the function f(x) = 2x + 3 as it satisfies the equation f(-1) = 2(-1) + 3 = 1.
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