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Home > CCA2 > Chapter 8 > Lesson 8.3.2 > Problem 8-163

8-163.
  1. For homework, Londa was asked to simplify the expression . She got the answer 7, but when she checked, she learned that the correct answer was −7. Homework Help ✎

    1. Show Londa the steps she could take to get −7.

    2. What steps do you think Londa took to get 7 as a result?

    3. What does she need to consider to avoid making this mistake in the future?

    4. Londa's example means that it is not always true that for real numbers a and b. What restriction needs to be placed on the numbers a and b?

Look at the negative signs.

Convert to imaginary form before completing operations.

They must be non-negative real numbers.