## How do you evaluate variable expressions?

To evaluate an algebraic expression means to find the value of the expression when the variable is replaced by a given number. To evaluate an expression, we substitute the given number for the variable in the expression and then simplify the expression using the order of operations.

## What is the value of the expression 3a b )( a 2b when a 2 and B 3?

18

The answer is 18. In order to evaluate this expression, you must replace a and b with the numbers 2 and 3. You must also remember that the expression…

**How do you evaluate an expression step by step?**

Here are the steps for evaluating an expression:

- Replace each letter in the expression with the assigned value. First, replace each letter in the expression with the value that has been assigned to it.
- Perform the operations in the expression using the correct order of operations.

### How do you evaluate a variable?

To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations. In the example above, the variable x is equal to 6 since 6 + 6 = 12. If we know the value of our variables, we can replace the variables with their values and then evaluate the expression.

### What is the answer of 3a 2b )( 3a 2b?

The answer to the question is 9a^2 – 4a^2.

**What is evaluate expression?**

To evaluate an algebraic expression means to determine the value of the expression for a given value of each variable in the expression. Replace each variable in the expression with the given value, then simplify the resulting expression using the order of operations.

## How do you evaluate an expression example?

Evaluating Algebraic Expressions

- Evaluate x + 3 for x = 7.
- Evaluate x2 + x – 3 for x = 2.
- Evaluate y2 + x3 + 7 for y = 2, x = 1.
- Evaluate 5 – x2 for x = -2.
- Evaluate (3x)(5y) for x = -1, y = 2.
- Evaluate -7×2 -5 + y2 – x for x = -2, y = 4.
- Evaluate 3×2 ÷ 12 + y for x = 4, y = -7.