Evaluating Functions (Junior Cert Mathematics): Quizzes

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Evaluating Functions
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What does evaluating a function mean?

Finding the output for a specific input

What does the notation f(3)f(3) mean?

Find the value of the function at x=3x=3

What should you do with xx when evaluating a function for a specific input?

Substitute the input value for xx

If f(x)=2x2+3f(x) = 2x^2 + 3, what is f(3)f(3)?

2121

If g(x)=4x−5g(x) = 4x - 5, what is g(2)g(2)?

33

When evaluating f(x)=2x2+3f(x) = 2x^2 + 3 for x=3x=3, what is the first calculation?

32=93^2 = 9

For f(x)=2x2+3f(x) = 2x^2 + 3, after squaring 3 to get 9, what is the next step?

Multiply by 2 to get 18

What is emphasised as important when performing operations in evaluating functions?

Perform operations in the right order

What is recommended after evaluating a function?

Double-check your calculations

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