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