-4 - (-7) = 6 - (-9) =

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Understand the Problem

The question is asking to perform subtraction involving negative numbers. We need to simplify the expressions by applying the rules of subtraction and handling negatives correctly.

Answer

- For the first expression: $3$ - For the second expression: $15$
Answer for screen readers

The final results are:

  • For the first expression: $-4 - (-7) = 3$
  • For the second expression: $6 - (-9) = 15$

Steps to Solve

  1. Understanding Subtraction of Negative Numbers
    When you subtract a negative number, it is equivalent to adding the absolute value of that number. Thus, we can rewrite the expressions.

  2. Simplifying the First Expression
    For the first expression, we have: $$ -4 - (-7) = -4 + 7 $$ Now, perform the addition: $$ -4 + 7 = 3 $$

  3. Simplifying the Second Expression
    For the second expression, we can rewrite it as: $$ 6 - (-9) = 6 + 9 $$ Now, perform the addition: $$ 6 + 9 = 15 $$

The final results are:

  • For the first expression: $-4 - (-7) = 3$
  • For the second expression: $6 - (-9) = 15$

More Information

When subtracting negative numbers, remember that you are effectively adding a positive number. This rule helps in simplifying many mathematical operations involving negatives.

Tips

  • A common mistake is to forget that subtracting a negative turns into addition. Always remember to transform subtraction of a negative into addition.

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