$\"\"$

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Given function is $\"\"$ .

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Replace $\"\"$ with y.

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$\"\"$

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Next Switch x for y and y for x.

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$\"\"$

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$\"\"$ .

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$\"\"$

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Next solve for y :

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$\"\"$

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$\"\"$ (Multiply each side by 4)

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$\"\"$ (Apply distributive property: $\"\"$ )

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$\"\"$ (Cancel common terms)

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Add 16 to each side) \ \

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ )

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The value of $\"\"$ . $\"\"$

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Write in function notation,using $\"\"$ to represent the invrse of the function f.

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$\"\"$

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"Y " value substitute in above function,

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$\"\"$ . $\"\"$

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The invrse of the function $\"\"$ is $\"\"$ .