HP 39GS HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 171
FNROOT(<expression>, <variable>, <guess>), FRAC(<num>), neighborhood of your desired solution.
UPC - 808736931328
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FNROOT(,,) This function is like a mini version of the Solve aplet. If you feed it an algebraic expression and an initial guess it will start from your guess and find the value which makes the expression zero. Don't bother. It's a lot easier to use the Solve aplet. This is a tool for programmers so that they can access the Solve abilities within programs. You need to tell it what variable is the active one in the expression, in addition to providing it with an initial guess. If there is only one answer then any guess will do, but if more than one solution is possible then more care needs to be taken with your guess to ensure that it is in the neighborhood of your desired solution. Eg. (a) Solve x2 − 3x − 5 = 0 Use: FNROOT(X2-3X-5,X,2) (b) Solve d − 5 = 3d +1 3 4 Use: FNROOT(D/3-5-3D/4-1,D,0) As with Solve, if your expression involves more than one variable then whatever values are currently in memory are used for the other variables. See also: QUAD, POLYROOT FRAC() This function gives the decimal part of any number, discarding the integer part. Eg. FRAC(3.45) = 0.45 FRAC(1234.03456) = 0.03456 See also: INT,FLOOR,CEILING,ROUND,TRUNCATE,FRAC 171
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