# What is the Value of the Expression Below?

This article explains how to find the value of expressions with variables by solving a specific expression. Learn what the value of the expression below is.

## Introduction

When it comes to math, expressions with variables can be quite intimidating. However, with the right knowledge and tools, solving them can be a breeze. In this article, we will be discussing one such expression and its value. So, what is the value of the expression below? Let’s dive in and find out.

## Understanding the Expression

The expression we will be discussing is:

``4x + 3y - 2z, where x = 5, y = 2, and z = 1.``

To find the value of this expression, we need to substitute the given values of x, y, and z into the equation and simplify it.

## Substituting the Values

Let’s start by substituting the value of x into the expression:

``````4(5) + 3y - 2z
= 20 + 3y - 2z``````

Now, let’s substitute the value of y:

``````20 + 3(2) - 2z
= 26 - 2z``````

Finally, let’s substitute the value of z:

``````26 - 2(1)
= 24``````

## Simplifying the Expression

As we saw earlier, the value of the expression `4x + 3y - 2z` when `x = 5`, `y = 2`, and `z = 1` is `24`. This process of substituting the values of variables and simplifying the expression is called evaluation.

However, we can also simplify the expression without substituting the values. To do this, we need to combine like terms. In our expression, the terms `4x` and `3y` are not like terms, but the term `-2z` is. So, we can simplify the expression as follows:

``````4x + 3y - 2z
= 4x - 2z + 3y``````

## Applications of Expressions

Expressions are not just a part of math textbooks, but they have practical applications in real life as well. For example, expressions can be used to calculate the cost of a product based on its price and the number of units sold. They can also be used to calculate the distance travelled by a vehicle based on its speed and time taken.

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Expressions are also used in computer programming, where they are used to create algorithms that perform specific tasks. For example, expressions can be used to calculate the area of a circle, or to determine the largest number in a list of integers.

Understanding expressions is therefore crucial for anyone who wants to excel in fields such as math, science, engineering, and computer programming. By mastering the basics of expressions, one can open up a world of opportunities and possibilities.

## Conclusion

In conclusion, the value of the expression `4x + 3y - 2z` when `x = 5`, `y = 2`, and `z = 1` is `24`. However, understanding expressions is not just about finding the value of an equation, but it has practical applications in fields such as math, science, engineering, and computer programming. By mastering the basics of expressions, one can gain a deeper understanding of the world around us and solve complex problems with ease.

## Simplifying the Expression

As we saw earlier, expressions with variables can seem complicated at first glance. However, by following a few simple steps, we can simplify them and find their values. The key is to remember the order of operations: Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right).

Let’s take a look at an example:

``3(4x + 2) - 5x``

To simplify this expression, we need to start by distributing the 3 on the left side:

``12x + 6 - 5x``

Now, we can combine like terms:

``7x + 6``

This is the simplified expression, and we can find its value by substituting the given value of x.

## Conclusion

Expressions with variables might seem daunting at first, but with a little practice, they can become second nature. Remember to always follow the order of operations when simplifying expressions and substituting values to find their values. By understanding these concepts, you’ll be able to solve complex equations and make calculations with ease. So, the next time you come across an expression like the one we discussed, you’ll know exactly what to do to find its value.

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