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I'm so lost please help me

I'm so lost please help me-example-1

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Answer:

51

Explanation:

The expression to be evaluated is x² - 3yz, where x = 9, y = -5, and z = -2.

To evaluate this expression, we substitute the given values of x, y, and z into the expression and perform the necessary calculations.

Substituting the values into our given expression:

⇒ x² - 3yz

⇒ (9)² - 3(-5)(-2)

Now calculating:

⇒ (9)² - 3(-5)(-2)

⇒ 81 - 30

∴ 51

Therefore, when x = 9, y = -5, and z = -2, the expression x² - 3yz evaluates to 51.


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Additional Terminology/Concepts:

Expression: A mathematical statement that contains variables, numbers, and operations but doesn't have an equal sign.

Evaluate: To find the numerical value of an expression for specific given values of the variables.

Substitution: The process of replacing variables in an expression with their given values.

Calculation: The act of performing mathematical operations to determine a result.

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