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I really dont understand how to find range of an equation of a function

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I really dont understand how to find range of an equation of a function

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Step 1

Domain of a function:

The domain of a function is the set of all possible values of the independent variable.

So, the domain can be calculated by identifying the value of x which is the independent variable.

Range of a function:

The range of a function is the set of all possible resulting values of the dependent variable.

So, the range can be calculated by substituting the values of x in the function.

Step 2

For example, consider...

f(x) x2+4
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f(x) x2+4

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