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Intermediate Algebra

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Graphing Linear Equations in Two Variables
Systems of Linear Equations
Polynomials
Factoring Polynomials
Rational Expressions and Equations
More Equations and Inequalities
Radicals and Complex Numbers
Relations and Functions
Quadratic Equations and Functions
Exponential and Logarithmic Functions

Quadratic Formula

Additional content: Proof of the quadratic formula

Khan Academy on the quadratic formula:

Completing the Square and the Quadratic Formula

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