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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.

## 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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## Solving Quadratic Equations with Complex Number Solutions - Using Square Roots

This lesson covers solving quadratic equations when the answers are complex numbers.
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## Adding and Subtracting Complex Numbers

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## Quadratic Formula and Complex Sums

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## Complex Number Solutions

by EPISD Algebra 2 Team //at grade
This lesson covers solving quadratic equations when the answers are complex numbers.
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## SLT 4 Explore complex numbers and their importance in mathematics.

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## SLT 8 Solve quadratic equations with real coefficients that have complex solutions.

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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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## Adding and Subtracting Complex Numbers

Provides examples of how to add and subtract complex numbers.
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• Study Guide

## Imaginary and Complex Numbers

Add, subtract, multiply, and divide complex numbers, as well as identify complex roots of quadratic functions.
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• Study Guide