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Here is the problem: integrate e to the power x from 0 to 1.

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Evaluate the definite integral of e to the power x from x equals 0 to x equals 1.

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Start with the definite integral.

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Exponential rule: the integral of eᵘ du equals eᵘ (divide by the inner slope).

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Antiderivative.

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Apply the fundamental theorem of calculus.

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So the answer is 1.718281828.

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A definite integral gives the signed area between the curve and the x-axis: area above the axis counts as positive and area below counts as negative.

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Differentiated the antiderivative and compared it with the integrand, which checks out.

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Adaptive Simpson prime s rule gives 1.718281828, which checks out.