Simplification

BODMAS Rule

This rule depicts the correct sequence in which the operations are to be performed, so as to find out the value of the given expression.

B - Bracket

O - Of

D - Division

M - Multiplication

A - Addition

S - Subtraction

Thus while simplifying an expression the operations must be executed according to this BODMAS rule.

Modulus of a Real Number

Modulus of a real number a is defined as

If a > 0 then |a| = a. If a < 0 then |a| = -a.

Hence, |7| = 7 and |-7| = -(-7) = 7.

Bar (or Virnaculum)

If an expression contains a bar over it then before applying the BODMAS Rule we simpify the expression under the bar.