Estimate the area under the graph off(x) = 9 + 4x^2 from x = −1 to x = 2

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You need to evaluate the area under the graph of f(x), from `x=-1`  to `x=2` , hence, you should use the definite integral such that:

`int_(-1)^2(9 + 4x^2) dx`

Using the linearity of integrals yields:

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