Hello! To solve this exercise, we must remember about Complex Numbers and Real Numbers. To understand it better, look to the image below:
Knowing it, let's analyze each number and classify them:
• -12 is a real number
• 0 + 9i = 9i is a non-real complex number
• i^6 = -1 is a real number
• 7 -5i is a non-real number
• -i² + i³ is a non-real number
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