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5-38.
  1. For homework, Crystal must simplify the expression . She gets the answer 3, but when she checks, she learns that the correct answer is –3. Homework Help ✎

    1. Show Crystal the steps she could take to get –3.

    2. What steps do you think Crystal took to get 3 as a result?

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

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

What is (−3)(−3)?

She needs to convert to imaginary form before completing operations.

They must be non-negative real numbers.