Learn how to evaluate an algebraic expression for two variables, x^2 -x+2xy-3; x= -3; y=4

The video tutorial explains how to evaluate an expression by substituting given values for variables X and Y. It emphasizes the importance of using parentheses to avoid mistakes in calculations, particularly when dealing with negative numbers and exponents. The tutorial guides viewers through the correct order of operations, ensuring accurate results. Finally, it demonstrates the step-by-step process of calculating the expression's value, highlighting common pitfalls and how to avoid them.

What is the first step in evaluating an expression when given specific values for variables?

• Substitute the given values into the expression

• Add the values together

• Multiply the values

• Divide the values

Why is it important to use parentheses when substituting negative numbers into an expression?

• To ensure the correct order of operations is followed

• To make the expression look neat

• To simplify the expression

• To avoid adding extra numbers

What is the result of squaring a negative number without using parentheses?

• A negative number

• A positive number

• The same negative number

• Zero

What is the correct order of operations when evaluating an expression?

• Addition, Subtraction, Multiplication, Division

• Exponents, Parentheses, Addition/Subtraction, Multiplication/Division

• Multiplication, Division, Addition, Subtraction

• Parentheses, Exponents, Multiplication/Division, Addition/Subtraction

What is the final result of the expression after substituting X = -3 and Y = 4 and following the correct order of operations?

• -15

• 15

• 9

• -9