Casio fx-991EX Quick Start Manual page 5

CALCULATE
...summation (sigma) notation,
qxIxd+1$-3$7=
...derivatives of a function at a specific point (value),
qyY4xd-5x$0.2=
...and definite integrals.
ya1$x$$2$5=.
Settings for the "Calculate" mode can be accessed by pressing
qp(SET UP).
Press R one or more times to reveal additional Setup options.
SOLVE
The fx-991EX can elegantly solve an equation for any unknown using Newton's method with the SOLVE command. To
use SOLVE, first input the equation to be solved, then press qr(SOLVE).
Solve x + Ax + Bx = 0 for x when A = 5 and B = 6.
2
Enter the equation by pressing, xd+Qz(A)
x+Qx(B) Qr(=)0.
fx-991EX Quick Start Guide 5