Evaluate an expression with one variable ex2, 2x + 3 - 2; x=5

The video tutorial explains how to evaluate the expression 2X + 3 - 2 when X = 5. It emphasizes the importance of simplifying expressions before evaluating them. The tutorial demonstrates substituting the value of X and performing calculations, highlighting the correct representation of multiplication in expressions. The final result of the expression is calculated to be 11.

Why is it beneficial to simplify an expression before evaluating it?

• It changes the value of the expression.

• It makes the expression more complex.

• It helps in understanding the problem better.

• It reduces the number of calculations needed.

What is the first step when substituting a value into an expression?

• Add the value to the expression.

• Replace the variable with the given value.

• Multiply the value by the expression.

• Divide the expression by the value.

How should multiplication between a number and a variable be represented?

• By using a subtraction symbol.

• By using a division symbol.

• By adding them together.

• By placing them next to each other.

What is the correct way to represent multiplication between two numbers?

• Subtract one from the other.

• Add them together.

• Use a multiplication symbol or parentheses.

• Place them next to each other.

What is the final result of evaluating the expression 2 * 5 + 1?

• 10

• 12

• 11

• 15