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3 and 5 are both complex numbers, and if you multiply them together, you get 15, which is a real number.

If you were looking for two non-real complex numbers, then any pair of complex conjugates will work. For example, 5+2i times 5-2i is 29.

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12y ago

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Name 2 complex number that when multiplied together become a real number?

Any pair of complex conjugates do that.


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Can you figure out two complex numbers where neither a nor b are zero that when multiplied together become a real number?

This might be a complex number and its conjugate: (a + bi) times (a - bi). More generally, any two complex numbers such that the angle formed by one is the negative of the angle formed by the other. In other words, you can multiply the conjugate by any real constant and still get a real result: (a + bi) times (ca - cbi). Specific examples: Multiply (3 + 2i) times (3 - 2i). Multiply (3 + 2i) times (6 - 4i).


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