Casio fx-991EX Quick Start Manual page 6

CALCULATE
Input an initial guess for x followed by the values of A and B.
Pressqr(SOLVE) -5p5p6p.
Arrow back up to x= and SOLVE the equation by
pressing p.
To accomplish the same task and solve for A or B, enter a
value for x and a value for one of the other unknowns.
For example, to solve for A when x = 1 and B = 4, press
qr(SOLVE)1p2p4p.
Arrow back up to A= and SOLVE the equation by
pressing p.
The solution also displays L – R = 0. This means that
Newton's method of approximation is directly on -5. If L – R
is not 0, simply recalculate to get a better approximation.
6 fx-991EX Quick Start Guide