Question

Evaluate the expression when x = 15

3x

Short answer

The value of the expression is 45.

Step-by-step solution

Apply the concept of product 

In mathematics, a product is the result of multiplication, or an expression that identifies factors to be multiplied. The numbers that are being multiplied are called the factors and the product of two numbers is the result you get when you multiply them together.

Example of the product

For example, 30 is the product of 6 and 5 (the result of multiplication), and is the product of and. (indicating that the two factors should be multiplied together).

$30= 6 · 5$(The two factors are 6 and 5)

$4y = 4 · y$(The two factors are 4 and y)

Evaluate the expression 3x when x = 15 

To evaluate the expression3x means 3 multiplied with x, then substitute the value of x as 15 and multiply with 3

When x = 15 and the value of the expression 3x is $3x = 3 · x = 3 · 15 = 45$

Thus, the value of the expression is45.