Algebra is the branch of mathematics that deals with the study of various symbols which represent such quantities as do not have a constant value or quantity associated with them, instead, they tend to vary or change over time with respect to some other factor. Such symbols are regarded as variables in the study of algebra, and the quantities attached to them are called coefficients. They can be depicted through various shapes or even English alphabets. In other words, algebra considers representing numbers through letters or symbols without laying emphasis on depicting their actual values.
Algebraic Expression
An algebraic expression is such a statement that is formed using variables and constants in mathematics, along with various arithmetic operations like addition, subtraction, multiplication, division, exponential operation, root extraction like square root, cube root, fourth root, so on and so forth.
Examples:
x + 1 is an algebraic expression with x as the variable and addition as the operation.
x2 − 1 is an algebraic expression with x as the variable and subtraction and exponent as the operation.
2x2 − 3xy + 5 is an algebraic expression with x and y as the variables with addition, exponent, subtraction and multiplication as the operations.
Basic Terminology
- Variable: A variable is such a term in an algebraic expression that can assume any value, its real value does not exist.
- Coefficient: It is a constant and well- defined which is always used with the variable.
- Operator: It means any arithmetic operation like addition, subtraction, multiplication, division, exponential operation, root extraction like square root, cube root, fourth root, so on and so forth.
- Constant: Such a term that is independent of both coefficient and the variable and is well- defined in itself is called the constant.
- Exponent: The number of times a number has been multiplied by itself refers to its exponent.
Rules of Exponents
1. If two or more bases have the same powers and are in multiplication, their powers are added together keeping the base intact, i.e., am × an = am+n.
Example:
23 × 25 = 23+5 = 28
4-2 × 43 × 4100 = 4-2+3+100 = 4101
2. If two or more bases have the same powers and are in the division, their powers are subtracted together keeping the base intact. It is to be noted that the power of the denominator is to be deducted from that power of numerator, i.e., am ÷ an = am-n.
Example:
= 24-3 = 21 = 2
= 104-8 = 10-4 =
3. Anything raised to the power zero equals to 1.
Example:
20 = 1
10000000 = 1
8590 = 1
4. When the power of an exponent already raised to a power is given, one needs to multiply those powers together, i.e., (am)n = amn.
Example:
(23)4 = (2)3×4 = 212
[(-3)-9]² = (-3)-9×2 = (-3)-18
5. Where two different bases have the same power, the bases are multiplied and the product is raised to the power both the bases had before multiplication, i.e., am × bm = (a × b)m.
Example:
43 × 103 = (4 × 10)3 = 403
2123 × 56123 = (2 × 56)123 = 112123
6. In case we are given a fractional exponent, then the numerator becomes the power of the base and the denominator is taken as the root of the whole expression, i.e., am/n =
Example
21/2 = √2
21/3 =
24/5 =
7. If the power is negative, reciprocate the base to make it positive, i.e., a-m =
Example
2-9 =
100-8 =
Simplify:
Solution:
Let a = 4m – 35
Since anything raised to the power 0 is always 1, we have
a0 = (4m – 35)0 = 1
Hence the given expression changes to 1/mn.
Thus,
.
Similar Questions
Question 1. Simplify: {(2a + b)0}2
Solution:
Using the property (am)n = amn
((2a + b)0)2 = (2a + b)0
Anything raised to the power 0 is always 1, hence
{(2a + b)0}2 = 1.
Question 2. Simplify: {(2a + b)4}0
Solution:
Using the property (am)n = amn
((2a + b)4)0 = (2a + b)0
Anything raised to the power 0 is always 1, hence
{(2a + b)4}0 = 1.
Question 3. Simplify:
Solution:
Let a = 4m + 26
Since anything raised to the power 0 is always 1, we have
a0 = (4m + 26)0 = 1
Hence the given expression changes to 1/mn.
Thus,