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5.6 Complex Numbers

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Solve the following quadratic: x 2 + 1 = 0 Is this quadratic factorable? What does its graph look like? But I thought that you could not take the square root of a negative number??? i is called an imaginary number because many thought that the square root of an imaginary number was impossible.

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Complex Numbers Complex numbers are the combination of real numbers and imaginary numbers. Complex numbers are written in the form: Real Part Imaginary Part

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Simplifying Complex Numbers

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Solve the quadratic equation

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Adding and Subtracting (add or subtract the real parts, then add or subtract the imaginary parts) Ex: Ex:

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Multiplying complex numbers Simplify the following:

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Multiplying complex numbers Simplify the following:

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