Root 指令

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Root[ <Polynomial> ]
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Root[ <Function>, <Initial x-Value> ]
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Root[ <Function>, <Start x-Value>, <End x-Value> ]
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Root[ <Polynomial> ]
Yields all roots of the polynomial as intersection points of the function graph and the x‐axis.
Root[ <Function>, <Number a> ]
Yields one root of the function using the initial value a for Newton's method.
Root[ <Function>, <Number a>, <Number b> ]
Yields one root of the function in the interval [a, b] (regula falsi).

CAS Syntax

Root[ <Polynomial> ]
Yields all roots of the polynomial as intersection points of the function graph and the x‐axis.
範例:
Root[x^3 - 3 * x^2 - 4 * x + 12] yields {x = 3, x = 2, x = -2}.
備註:
This command is only a special variant of Solve Command.
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