Evaluating Expressions with Variables

The video tutorial explains how to evaluate a mathematical expression by substituting given values for variables x and y. It demonstrates the process of substitution, applying the order of operations, and performing calculations to arrive at the final result. The expression involves squaring a number, multiplying, and adding constants, ultimately leading to a negative result.

What is the expression that needs to be evaluated when x = 7 and y = 1?

• -3x^2 - 10y + 4

• 3x^2 + 10y + 4

• -3x^2 + 10y + 4

• 3x^2 - 10y + 4

What is the first step in simplifying the expression after substituting x = 7?

• Add 4 to the result

• Calculate 7 squared

• Multiply -3 by 7

• Add 10 to y

What is the result of 7 squared?

• 42

• 49

• 56

• 63

What is the result of multiplying -3 by 49?

• -147

• 147

• -150

• 150

What is the final result of the expression after all calculations?

• 147

• -133

• 133

• -147

What is the value added to -147 to get the final result?

• 10

• 7

• 4

• 14