How to Evaluate a Mathematical Expression: Example of 3x + 2 when x = 5

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To evaluate a mathematical expression or equation means to find its numerical value

To evaluate a mathematical expression or equation means to find its numerical value. Here is an example of how to evaluate an expression:

Let’s evaluate the expression 3x + 2 when x = 5.

To do this, we substitute the value of x into the expression. So we replace every x with 5:

3(5) + 2

Now we simplify the expression according to the order of operations, which states that we perform any calculations inside parentheses first, then exponents, then multiplication and division (from left to right), and finally addition and subtraction (from left to right).

3(5) means multiplying 3 by 5, which gives us 15.

So our new expression becomes:

15 + 2

Now we add 15 and 2 to get our final result:

15 + 2 = 17

Therefore, when x = 5, the expression 3x + 2 evaluates to 17.

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