Efficient Use of Your fx-50FH
Memory
There are 7 memories in a calculator, namely A, B, C, D, X, Y and M. Actually, there are
hidden memories but we mainly talk about these 7 memories in this notes.
Memory Recall
To recall any of the 7 memories, say A, press
RCL A
Memory Store
1. To store a number to a memory, e.g. to store 2 to B, press
2 SHIFT STO B
The screen displays “2→B” on the 1st line and “2” on the 2nd line.
2.
To store the answer of a calculation to a memory, e.g. to store 4  5 to C, press
√( 4 + 5 SHIFT STO C
The screen displays “√(4+5→C” on the 1st line and the answer “3” on the 2nd line.
Memory Clear
To clear all the memories, press
SHIFT 9 1 EXE
Calculations using the memories directly
To proceed, check whether the cursor is “_”. Press SHIFT DEL to change if the cursor is “|”.
e.g. To solve the quadratic equation 2x2 + 3x + 1 = 0,
1. Store 2, 3, 1 to A, B, C respectively
2. To calculate the discriminant and store it to D, press
ALPHA B x2 – 4 ALPHA A ALPHA C SHIFT STO D
The screen displays “B2–4AC→D” on the 1st line and the discriminant “1” on the
2nd line.
3. To get the 1st root, press
( (-) ALPHA B + √( ALPHA D ) ) a b/c ( 2 ALPHA A EXE
The screen displays “(-B+√(D))┘(2A” on the 1st line and the 1st root “–1┘2” on
the 2nd line.
4. To get the 2nd root, press
► ► ► ► – EXE
The screen displays “(-B–√(D))┘(2A” on the 1st line and the 2nd root “–1” on the
2nd line.
P. 1
Special functions for the memory M
There are 2 special functions for the memory M, namely M+ and M–. When there is a value
other than 0 in M, a small “M” will appear on the top of the screen. It’s recommended to clear
the memory M before performing any of the following calculations.
1. Pressing M+ after an expression will add the value of the expression to M.
e.g. To calculate 12 + 32 + 52 + 72 + 92, press
1 x2 M+ 3 x2 M+ 5 x2 M+ 7 x2 M+ 9 x2 M+ RCL M
2. Pressing SHIFT M–, after an expression will subtract the value of the expression from
M.
e.g. If a student got 3, 4 and 5 marks deducted in an exam, to calculate his/her score,
press
100 M+ 3 SHIFT M– 4 SHIFT M– 5 SHIFT M– RCL M
Function evaluation & Table construction
x
1
2
3
2
x + 3x + 2
To fill in the above table, press
1 SHIFT STO X ALPHA X x2 + 3 ALPHA X + 2 EXE
2 SHIFT STO X ▲ EXE
3 SHIFT STO X ▲ EXE

4
5
Application to Definite Integration
During definite integration, we always come across expressions like
 f ( x)ba . Its value equals
f (b) – f (a).
2
 x3 x2 
e.g. To calculate    , i.e.
2 1
3
 2 3 2 2   13 12 
       , press
2  3 2
 3
2 SHIFT STO X
ALPHA X x3 a b/c 3 + ALPHA X x2 a b/c 2 SHIFT STO M
1 SHIFT STO X
▲ ◄ DEL SHIFT M–
RCL M
The unstable memory Ans
Ans is said to be unstable because after every calculation, its value will be updated to the
current answer. After a calculation, if you want to store the answer to a stable memory, say Y,
press Ans SHIFT STO Y.
P. 2