123-1-2-324-2-4xyOpen image in a new page

The curve y = x2 + 2, showing the portion under the curve from x = −1 to x = 2.

The required area is totally below the `x`-axis in this example, so we need to use absolute value signs.

`text[Area] = |int_a^bf(x) dx|`

`=|int_-1^2(x^2-4) dx|`

`=|[x^3/3 - 4x]_-1^2|`



`=9\ text[units]^2`

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