HP 48G - Page 17

SOLVE
will numerically* solve a general algebraic
equation, a differential equation, or a linear system
(and two other specific kinds of algebraic equations—
polynomials and compound interest). In each case,
you key in either the equation or its coefficients—as
it equates to zero—then solve for the variable(s).
Example: Find all roots of 4x*~11x-7. Press(—>]SOLVE
and select S0 1we pold.. Now key in the coef-
ficients (including zeroes for any missing terms) as a
vector: [ 4 B =11 =7 1. Then, with the highlight
on the kOOTs: field, press EINMS.... The roots will ap-
pear as the terms in a vector—either real or complex
—both in the kOOT:: field and tagged on the stack.
(Note that you can get a symbolic version of either the
polynomial or its solution(s) on the stack if you press
while highlighting the desired field.)
The linear system option (A * X = B) is similar, except
that you key in a matrix (A) of coefficients, plus a vec-
tor(B) of constants, then solve for vector X.
(74)
(e[sowvE)offers amenu-based solver (called SOLVR).
The mechanics are simple: Store your equationinEll,
then start SOLVR. Toindicate aknownvalue, justkey
itin and press the desired menu key; to recall a value,
press (@) and then the desired menu key; to calculate
a value, press (& before the desired menu key.
(75)
B TR T EEE . T
(30) BN
(menu items will vary with contents of E))
(76)
[KKF KRK |RKF3|RRES |RKFE [RZEER]
T 1 1 IsoLvE
(77)
PrOOTIPCOEF[PEVAL] | [sOLVE
(78)
I TN I I.T
(79)
TT T T I T
(80) HINI
CeO=vR] R 1 (PHTI CFe 1R
CEvE I ]
*To solve an equation symbolically for any particular variable, use
Isolate war. orSolwe gquad. in (B)sYMBoLC).
and 15