Algebraic expressions With instance Problems and Interactive Exercises
Use the following examples and also interactive practice to learn around Writing Algebraic Expressions.
You are watching: Write as an algebraic expression 22 of a
Solution: Let g represent the number of groups in Ms. Jensen"s class.
Then 2 · g, or 2g have the right to represent "g groups of 2 students".
In the difficulty above, the variable g represents the number of groups in Ms. Jensen"s class. A variable is a symbol used to stand for a number in an expression or an equation. The value of this number deserve to vary (change). Let"s look at an example in i m sorry we use a variable.
Example 1: Write each phrase as a math expression.
| Phrase | Expression |
| the amount of nine and eight | 9 + 8 |
| the sum of nine and a number x | 9 + x |
The expression 9 + 8 represents a solitary number (17). This expression is a numerical expression, (also dubbed an arithmetic expression). The expression 9 + x represents a value that have the right to change. If x is 2, climate the expression 9 + x has a worth of 11. If x is 6, climate the expression has a worth of 15. So 9 + x is an algebraic expression. In the next couple of examples, we will be working specifically with algebraic expressions.
Example 2: Write each phrase as one algebraic expression.
| Phrase | Expression |
| nine boosted by a number x | 9 + x |
| fourteen decreased by a number p | 14 - p |
| seven much less than a number t | t - 7 |
| the product the 9 and a number n | 9 · n or 9n |
| thirty-two divided by a number y | 32 ÷ y or  |
In example 2, every algebraic expression included one number, one operation and one variable. Let"s look at at an instance in i beg your pardon the expression consists of more than one number and/or operation.
Example 3: Write each phrase as one algebraic expression utilizing the change n.
| Phrase | Expression |
| five more than twice a number | 2n + 5 |
| the product the a number and also 6 | 6n |
| seven separated by double a number | 7 ÷ 2n or  |
| three time a number reduced by 11 | 3n - 11 |
Solution: Let e represent the number of employees in the company. The lot of money every employee will obtain is stood for by the complying with algebraic expression:
Solution: Let x stand for the number of hours the electrician works in one day. The electrician"s earnings can be stood for by the complying with algebraic expression:
Solution: 45x - 20
Summary: A variable is a symbol supplied to stand for a number in an expression or an equation. The value of this number have the right to change. An algebraic expression is a math expression that consists of variables, numbers and operations. The worth of this expression have the right to change.
Exercises
Directions: select the algebraic expression that correctly represents the expression provided. Choose your prize by clicking on its button. Feedback to her answer is detailed in the outcomes BOX. If you do a mistake, pick a different button.
| 1. | Fifteen much less than twice a number |
| 15 - 2x2x + 152x - 15None that the above. RESULTS BOX: |
| 2. | Three time a number, boosted by seventeen |
| 3(a + 17)3a + 17(17 + 3)aNone the the above. RESULTS BOX: |
| 3. | The product the nine and also a number, reduced by six |
| 9(m - 6)6(9 - m)9m - 6None of the above. RESULTS BOX: |
| 4. | Thirty split by seven times a number | |
| 30 + 7n | ||
 | ||
| 30(7n) | ||
| None the the above. See more: What Is The Most Popular Sport In Guatemala ? What Are The Most Popular Sports In Guatemala |
| RESULTS BOX: |
| 5. | Jenny earns $30 a day working part time at a supermarket. Compose an algebraic expression to represent the amount of money she will earn in d days. | |
| 30d | ||
 | ||
| 30 + d | ||
| None that the above |
| RESULTS BOX: |