Resposta:

To simplify this expression, we can use polynomial long division as follows:

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4x^2 + 5x + 20

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x - 4 | 4x^3 - 19x^2 + 16x - 16

- 4x^3 + 16x^2

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-3x^2 + 16x

+ 3x^2 - 12x

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4x - 16

4x - 16

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0

Therefore, the simplified expression is:

4x^2 + 5x + 20