HP 35s HP 35s scientific calculator - User Guide - Page 328
Special Case: A Discontinuity and a Pole
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Values of f(x) may be approaching infinity at the location where the graph changes sign (see figure b, below). This situation is called a pole. Since the SOLVE operation determines that there is a sign change between two neighboring values of x, it returns the possible root. However, the value for f(x) will be relatively large. If the pole occurs at a value of x that is exactly represented with 12 digits, then that value would cause the calculation to halt with an error message. f (x) f (x) x x a b Special Case: A Discontinuity and a Pole Example: A Discontinuous Function. Find the root of the equation: IP(x) = 1.5 Enter the equation: Keys: X Display: Description: Selects Equation mode. Enter the equation. Checksum and length. Cancels Equation mode. D-6 More about Solving