# 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.
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## Quadratic Formula and Complex Sums

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## Solving Quadratic Equations with Complex Number Solutions

This lesson covers solving quadratic equations when the answers are complex numbers.
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• PLIX

## Quadratic Formula and Complex Sums: Vertical and Horizontal Shift 2

Quadratic Formula and Complex Sums Interactive
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## Quadratic Formula and Complex Sums: Vertical and Horizontal Shift

Quadratic Formula and Complex Sums Interactive
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• Video