Math Problem Statement

Which of these expressions have the same value as -11 - (-3)?

Solution

The problem asks which of the expressions have the same value as 11(3)-11 - (-3). Let's first simplify the original expression step by step:

11(3)=11+3=8-11 - (-3) = -11 + 3 = -8

Now, let's evaluate each of the given choices to see which ones are equivalent to 8-8:

  1. 11+3-11 + 3 11+3=8-11 + 3 = -8 This is equivalent to the original expression, so it's a valid option.

  2. 11(3)11 - (-3) 11(3)=11+3=1411 - (-3) = 11 + 3 = 14 This is not equivalent to 8-8, so this is incorrect.

  3. 11+(3)-|11 + (-3)| 11+(3)=8and8=811 + (-3) = 8 \quad \text{and} \quad -|8| = -8 This is equivalent to the original expression, so it's another valid option.

Thus, the correct answers are the first and third expressions.

Would you like more details or have any questions? Here are five follow-up questions to think about:

  1. Why does subtracting a negative number result in addition?
  2. How does the absolute value function affect the result?
  3. What is the rule for distributing negatives across parentheses?
  4. Can you think of another equivalent expression for 11(3)-11 - (-3)?
  5. What happens when you reverse the terms in subtraction, like 3(11)3 - (-11)?

Tip: When subtracting a negative, always change the operation to addition to avoid errors.

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Math Problem Analysis

Mathematical Concepts

Algebra
Simplification
Negative Numbers
Absolute Value

Formulas

Simplification: -11 - (-3) = -11 + 3
Absolute Value: |-x| = x

Theorems

The rule of adding the opposite when subtracting a negative number

Suitable Grade Level

Grade 7