### Negative sign

On a Casio calculator you can enter negative numbers with the key

##### Example 1

To calculate 5 × −2 = −10

 5 × (−) 2 = 5×-2          -10.

##### Example 2

To calculate 2−1 = 0.5

 2 ∧ (−) 1 = 2∧-1          0.5

##### Example 3

To store the value −123 in variable A

 (−) 1   2   3 RCL (−) -123→A         -123.

##### Example 4

To calculate cos-1(−1) = π

 cos (−) 1 = cos-1 -1  3.141592654

##### Example 5

To calculate (−2)4 = 16

 ( (−) 2 ) ∧ 4 = (-2)∧4           16.

When a calculation contains an argument that is a negative number, this negative number must be enclosed within brackets. The negative sign (−) is treated as a type B function, so particular care is required when the calculation includes a high priority type A function, or power or root operation.

##### Example 6

A negative sign cannot be used to perform a subtraction

 2 (−) 1 2-1_            0. = Syntax ERROR

##### Example 7

To calculate 2 − − 1 = 3

 2 − (−) 1 = 2− -1_            3.

##### Example 8

To calculate 3 × 5 × 10−9 = 1.5 × 10−8

 3 × 5 EXP (−) 9 = 3×5E-9       1.5-08