Evaluating Expressions with Multiplication

The video tutorial explains how to evaluate mathematical expressions by substituting given values into equations. It covers three problems involving multiplication and negative numbers, providing step-by-step guidance to avoid common mistakes. The tutorial emphasizes the importance of using parentheses to manage signs and ensure accurate calculations.

What does evaluating expressions generally involve?

• Ignoring the order of operations

• Creating new equations from scratch

• Substituting given values into an equation

• Solving equations without any given values

In the expression 4A * B, if A = -3 and B = 2, what is the result?

• -12

• 24

• -24

• 12

When substituting values into an expression, why is it important to use parentheses?

• To make the expression look more complex

• To ensure correct order of operations and sign handling

• To change the values of the variables

• To avoid using a calculator

What is the result of the expression - (A * B) when A = -3 and B = 2?

• 6

• -6

• -12

• 0

How does a negative sign outside parentheses affect the expression inside?

• It doubles the value inside

• It changes the sign of the result inside

• It adds 1 to the result inside

• It has no effect