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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.

## 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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## Solving Quadratic Equations with Complex Solutions - Quadratic Formula

Identifying complex roots of quadratic functions with the quadratic formula, and adding and subtracting complex numbers.

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## Adding and Subtracting Complex Numbers

Identifying complex roots of quadratic functions with the quadratic formula, and adding and subtracting complex numbers.

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## Quadratic Formula and Complex Sums

by Kaitlyn Spong //at grade

Identifying complex roots of quadratic functions with the quadratic formula, and adding and subtracting complex numbers.

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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.

by MCPS Math //at grade

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

by MCPS Math //at grade

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• Study Guide

## Imaginary and Complex Numbers

by Rayna Schlossberg //at grade

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

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• Study Guide

## Imaginary and Complex Numbers

by Tabitha Nickerson //at grade

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

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