Flashcard 3.2 Function Notation and Evaluating Functions (S)

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Mathematics
•
9th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
What is a function?
Back
A function is a relation that assigns exactly one output for each input. In other words, for every x-value, there is one and only one corresponding y-value.
2.
FLASHCARD QUESTION
Front
What does it mean for a relation to NOT be a function?
Back
A relation is not a function if at least one input is associated with more than one output.
3.
FLASHCARD QUESTION
Front
Evaluate the function f(x) = x² - 8 at x = 2.
Back
f(2) = 2² - 8 = 4 - 8 = -4.
4.
FLASHCARD QUESTION
Front
Evaluate the function f(x) = x² - 8 at x = 3.
Back
f(3) = 3² - 8 = 9 - 8 = 1.
5.
FLASHCARD QUESTION
Front
What is the sum of f(2) and f(3) for f(x) = x² - 8?
Back
f(2) + f(3) = -4 + 1 = -3.
6.
FLASHCARD QUESTION
Front
How do you solve for x in the equation f(x) = 2x + 9 when f(x) = 15?
Back
Set 2x + 9 = 15, then solve for x: 2x = 15 - 9, 2x = 6, x = 3.
7.
FLASHCARD QUESTION
Front
Evaluate the function h(n) = n² + 2n at n = 4.
Back
h(4) = 4² + 2(4) = 16 + 8 = 24.
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