**Negative Sign**

The Casio calculator distinguishes, using different keys, between the unary operation of negation and the binary operation of subtraction.

To enter a negative number, use the negation key, **( - )**, located to
the left of the EXE key. To subtract two numbers,
use the minus located above the EXE key.

For
example, to subtract -5 from 17, compute 17 - (-5). Press **MENU
1** to access the RUN-MAT menu. Press

**1 7 - ( ( - ) 5 ) EXE**

To enter the function Y1 = -X, use the negation key, not the minus sign.