Problem 59 - College Algebra

Question

simplify each algebraic expression. $$ 5(3 x+4)-4 $$

Step-by-Step Solution

Answer

The simplified expression for \(5(3x + 4) - 4\) is \(15x + 16\).

Step 1: Distribute 5 across the terms inside the parentheses

To execute this operation, multiply each term within the parentheses by 5. So, the operation would look like this: \(5*3x + 5*4 - 4\)

Step 2: Simplify Each Term

Perform the multiplication in each term. We get: \(15x + 20 - 4\)

Step 3: Combine Like Terms

The last step is to combine like terms, which operation will be as follows: \(15x + 20 - 4 = 15x + 16\)

Key Concepts

Distributive Property

Understanding the distributive property is essential when simplifying algebraic expressions. This property comes into play when you have a number outside the parentheses which needs to be multiplied by each of the terms inside.

Let's unravel how it works using an example. Consider the expression \(5(3x + 4) - 4\). Here, according to the distributive property, you multiply 5 with both 3x and 4, which are within the parentheses. So, it becomes \(5 \times 3x + 5 \times 4\). Why do we do this? It's like sharing equally; each term inside the parentheses receives the same 'gift' from the number outside, which in this case is 5. The distributive property ensures that you're multiplying evenly, setting the stage for further simplification.

Combine Like Terms

Once you've distributed your terms evenly, the next step in simplifying algebraic expressions is to 'combine like terms'. But what does that mean? Like terms are elements in an expression that have the exact same variable parts and powers. They can dance together while the unlike terms must stand aside.

In our example, after distributing, we got \(15x + 20 - 4\). Notice there are no like terms with \(15x\), but \(20\) and \(4\) are both constants with no variables attached. These are like terms, and they are more than happy to come together! We subtract 4 from 20, giving us \(15x + 16\), nicely combining those like terms into a simpler, more elegant form. Remember, combining like terms is like tidying up your room; it's all about grouping similar things together for a neater, more manageably looking space—or in this case, expression.

Algebraic Manipulation

Algebraic manipulation is the art of reshaping algebraic expressions into a form that's easier to understand or use. It is a combination of the strategies, including the distributive property and combining like terms, that we've discussed above.

Imagine your equation is a piece of clay, and through algebraic manipulation, you're the artist that decides what final shape it takes. After distributing and combining like terms, we got our expression down to \(15x + 16\). That is the result of our constant kneading and molding of the mathematical clay to get it just right. The goal is simple: achieve the clearest, simplest expression possible, so anyone who reads it can grasp its meaning without stumbling over unnecessary complications. With practice, anyone can become a master of algebraic manipulation—turning complex, daunting expressions into neat, orderly ones.