Problem 84 - Introductory and Intermediate Algebra for College Students 4th

Question

State a form of the distributive property and give an example.

Step-by-Step Solution

Answer

The distributive property of multiplication over addition is \(a(b + c) = ab + ac\). An example is the expression \(3(2 + 4)\), which becomes \(6 + 12 = 18\) when applying the distributive property.

Step 1: State the Distributive Property

The distributive property of multiplication over addition expresses the multiplication of a sum as a sum of individual products. Mathematically, this property can be written as \(a(b + c) = ab + ac\). The number \(a\) is multiplied with each of the terms inside the parentheses.

Step 2: Provide an Example of the Property

Take for example the expression \(3(2 + 4)\). According to the distributive property, you can distribute '3' across the two terms inside the parentheses. This will lead to the new expression \(3*2 + 3*4\), which simplifies to \(6 + 12 = 18\)

Step 3: Check your work

To verify this, calculate the original expression without the distribution, \(3(2 + 4) = 3*(6) = 18\). Both methods lead to the same result, verifying the distributive property.

Key Concepts

Algebra: The Language of Mathematics

At its core, algebra is a branch of mathematics that uses symbols and letters to represent numbers and quantities in formulas and equations. This approach allows for the generalization of arithmetic, making it possible to describe and solve problems about numbers without specifying the values of those numbers. For instance, equations like \(x + 2 = 5\) illustrate how algebra uses letters such as \(x\) to signify unknown values that we aim to find. Algebra serves as the foundational language for much of modern mathematics and its various applications, facilitating the exploration of relationships between quantities and the construction of models to solve real-world problems.

Multiplication Over Addition: Understanding the Distributive Property

The distributive property is a critical mathematical rule often used in algebra. It allows us to 'distribute' a multiplication operation over an addition operation within an expression. In other words, it involves multiplying each addend separately and then adding the products. The formula for this property is given by \(a(b + c) = ab + ac\).

Let's consider a tangible example - if you have 3 bags with the sum of 2 oranges and 4 apples in each, applying distributive property would mean you're finding out how many oranges and apples there are in total by multiplying 3 with both 2 and with 4, then adding the results. In addition, this property is handy for simplifying algebraic expressions and solving equations, making it an indispensable tool in any student's mathematical toolkit.

Mathematical Properties: Rules That Govern Numbers

Mathematics operates on a set of fundamental principles known as mathematical properties. These properties are the rules of the game that dictate how numbers and operations interact. Aside from the distributive property, there are other key properties such as the commutative property (e.g.,\(a+b = b+a\)), the associative property (e.g.,\((a+b)+c = a+(b+c)\)), and the identity property (e.g.,\(a+0 = a\)). These rules ensure consistency and order within the numerical world, allowing mathematicians to carry out operations with confidence that the outcome will be logical and consistent. Understanding these properties is essential as they form the basis for all mathematical computation and problem solving.