91Ó°ÊÓ

Real numbers are simply the combination of Whole numbers, Integers, Rational and Irrational numbers in the number system.

Suppose a, b, and c is three real numbers.

Commutative Property of Addition:

Property: a + b = b + a

If you add two real numbers in any order, the sum will always be the same.

Example: 5 + 2 = 2 + 5 = 7

Commutative property of Addition states, if you add two real numbers in any order, the sum will always be the same.

Evaluate the expression:

To evaluate the expression$3+j+(- 9)$, the termlocalid="1647589809672" $x$is a variable. The terms17and12are constants.

Using the Commutative property of addition, adding like terms,

$\begin{array}{l}3+j+(−\text{ }9)\text{ â¶Ä‰}\\ j+(3+−\text{ }9)\text{ â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰}\left(\text{Make â¶Ä‰a â¶Ä‰group â¶Ä‰with â¶Ä‰constant â¶Ä‰terms â¶Ä‰}\right)\\ j+(−\text{ }9+3)\text{ â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰â¶Ä‰â€‰}(\text{Commutative â¶Ä‰Property â¶Ä‰of â¶Ä‰Addition)}\\ j−\text{ â¶Ä‰}6\end{array}$

$3+j+(−\text{ }9)\text{ â¶Ä‰}=\text{ â¶Ä‰}j\text{ â¶Ä‰}−\text{ â¶Ä‰}6\text{ }$