HP 35s HP 35s scientific calculator - User Guide - Page 340
More about Integration, Display, Description, Enter the equation.
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Try it and see what happens. Enter the function f(x) = xe-x. Keys: Display: Description: X X Select equation mode. Enter the equation. End of the equation. Checksum and length. Cancels Equation mode. Set the display format to SCI 3, specify the lower and upper limits of integration as zero and 10499, than start the integration. Keys: Display: Description: 8(2 X Specifies accuracy level and limits of integration. Selects Equation mode; displays the equation. Approximation of the integral. The answer returned by the calculator is clearly incorrect, since the actual integral of f(x) = xe-x from zero to ∞ is exactly 1. But the problem is not that ∞ was represented by 10499, since the actual integral of this function from zero to 10499 is very close to 1. The reason for the incorrect answer becomes apparent from the graph of f(x) over the interval of integration. E-4 More about Integration