Finding Inputs of Functions (Leaving Cert Mathematics): Quizzes

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Finding Inputs of Functions
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What does 'finding inputs of a function' mean?

Determining xx from a given output

What is the independent variable usually called when finding inputs?

xx

For f(x)=2x+3f(x) = 2x + 3, what input gives output 11?

x=4x = 4

What is the first step to find input when output is known?

Set f(x)f(x) equal to the output value

How do you verify your answer after finding the input?

Substitute back into original function

For f(x)=2x+3f(x) = 2x + 3, what equation solves for input when output is 11?

2x+3=112x + 3 = 11

What does f(x)f(x) represent in the context of finding inputs?

The output of the function

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