Why is the area of the function -1 in this case?

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I understand that I need to get the area of the shape from 0 to 2 and subtract the area of the shape from 2 to 4 to get the area of 0 to 4, but how do I calculate the area of the second shape?

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The question asks for you to find the integral from $2$ to $4$ of the function $f(x)$. Since $f(x)$ is non positive from $2$ to $4$, we expect that the value of the integral is not positive and there is only one non positive answer.