Evaluating Functions (Junior Cert Mathematics): Flashcards

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Evaluating Functions
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Evaluating a function

Finding output for a specific input

Meaning of f(2)f(2)

Value of ff when x=2x = 2

Key step in evaluating functions

Replace xx with the input value

f(3)f(3) when f(x)=2x2+3f(x) = 2x^2 + 3

2121

g(2)g(2) when g(x)=4x−5g(x) = 4x - 5

33

Operations in f(x)=2x2+3f(x) = 2x^2 + 3

Square xx, multiply by 2, add 3

First step for f(3)f(3) in f(x)=2x2+3f(x) = 2x^2 + 3

Square 3: 32=93^2 = 9

Order when evaluating functions

Perform operations in the right order

After calculating function value

Double-check calculations

Where to substitute input value

Everywhere xx appears in the function

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