Evaluating Expressions in SOL 8.14a

The video tutorial explains how to use Desmos to evaluate mathematical expressions effectively. It emphasizes the importance of typing expressions exactly as given and defining variables separately to avoid errors. The tutorial provides examples, including evaluating expressions with multiple variables and division expressions, demonstrating the correct method to achieve accurate results. The video concludes with a reminder to double-check inputs to ensure accuracy.

Why is Desmos considered a valuable tool for evaluating expressions?

• It provides step-by-step solutions.

• It can solve equations symbolically.

• It allows for easy graph plotting.

• It helps avoid mistakes by allowing exact input of expressions.

What should you do first when given an expression to evaluate in Desmos?

• Type the expression exactly as given.

• Check for syntax errors.

• Define all variables.

• Simplify the expression manually.

If you have multiple variables in an expression, how should you handle them in Desmos?

• Use a single line for all variables.

• Ignore additional variables.

• Use separate lines for each variable.

• Combine variables into one expression.

In the first example, what is the value of x?

• 12

• 20

• 4

• 3

What is the result of the expression in the first example when x=4, y=-12, and z=-20?

• 30

• 25

• 35

• 40

Why is it not recommended to manually plug in variables into the expression in a calculator?

• It is against exam rules.

• Calculators cannot handle variables.

• It can lead to mistakes.

• It takes too much time.

In the second example, what is the numerator of the expression?

• k + 4 squared - 1

• k + 7

• k + 4

• k - 1

What is the value of k in the second example?

• -1

• 0

• -2

• 2

What is the final result of the expression in the second example?

• 0.8

• 0.5

• 0.7

• 0.6

What is the final step after inputting the expression and defining variables in Desmos?

• Graph the expression.

• Check the expression for accuracy.

• Save the expression.

• Simplify the expression.