Showing posts with label Real Numbers. Show all posts
Showing posts with label Real Numbers. Show all posts

Monday, October 8, 2012

Algebra Properties of Real Numbers

Introduction to algebra properties of real numbers:

In algebra, numbers that are used to measure the real-world quantities like area, speed, length, probability, temperature, volume, rate and so on. Those numbers should be called as real numbers. Few examples for that number should be 9, -12, 0, 2.523, `sqrt(3)` , `(sqrt(5))/(3)`, 3×106, `pi` so on. Algebra properties of real numbers should express in terms of addition as well as multiplication. Here we will see about the algebra properties of real numbers.

List of Properties:

The lists of properties in algebra for the real numbers are shown below:

Commutative properties
Associative properties
Distributive properties
Identity properties
Inverse properties

Explanation of Properties:

Let us consider the numbers a, b and c are the real numbers.

Commutative properties:

i) a + b = b + a

ii) a × b = b × a

This property says that the order in which we add or multiplication with real number that should not affect the solution.

Example:

2 + 5 = 7 = 5 + 2
3 × 4 = 12 = 4 × 3


Associative properties:

i) (a+b)+c = a+(b+c)

ii) (a×b)×c = a×(b×c)

This property tells that when the real numbers are grouping in terms of adding or multiplied could not matter. Here, the parentheses should not make a sense.

Example:

(5+6)+2 = 13 = 5+(6+2)
(2×3)×4 = 24 = 2×(3×4)


Distributive properties:

i) a×(b+c) = (a×b) + (a×c)

ii) (b+c)×a = (b×a) + (c×a)

Example:

3×(2+5) = (3×2) + (3×5) = 6 + 15 = 21
(2+5)×3 = (2×3) + (5×3) = 6 + 15 = 21


Identity properties:

i) a+0 = 0+a = a

ii) a×1 = 1×a = a

Here, 0 -> Additive identity and 1 -> Multiplicative identity.

Example:

3+0 = 0+3 = 3
4×1 = 1×4 = 4

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Inverse properties:

i) For every real number a. -a is called additive inverse of a, when, a+(-a) = (-a)+a = 0.

ii) For every real number a`!=` 0. `(1)/(a)` is called multiplicative inverse of a, when a × `(1)/(a)` = `(1)/(a)` × a.

Example:

5+(-5) = (-5)+5 = 0
2 × `(1)/(2)` = `(1)/(2)` × 2 = 1
These are the properties of real numbers in algebra.