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# Quadratic Formula and Complex Sums

## Conversion between a + bi and (a, b), (r, theta), and rcistheta.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
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## Using the Quadratic Formula

by CK-12 //basic

How to use the quadratic formula, as explained by Khan Academy.

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## Operations - Overview

by CK-12 //basic

Overview

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## Complex Solutions of a Quadratic Equation - Overview

by CK-12 //basic

Overview

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## Operations - Example 1

by CK-12 //basic

Adding and Subtracting Complex Numbers

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## Operations - Example 2

by CK-12 //basic

Multiplying Complex Numbers

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