A.EI.3.a

Solve a quadratic equation in one variable over the set of real numbers with rational or irrational solutions, including those that can be used to solve contextual problems.

Example Problems
Solve the equation:
Solve the equation:
Solve the equation:
Khan Academy Resources
Understanding the quadratic formulaSolving quadratics by completing the squareSolving quadratics by factoring reviewCompleting the square reviewSolving simple quadratics reviewSolving quadratics by taking square roots Quadratic formula reviewSolving quadratics by factoringQuadratic formulaQuadratics by factoring (intro)Quadratics by factoringQuadratics by taking square rootsQuadratic word problems (standard form)Solve equations by completing the squareQuadratics by taking square roots (intro)Quadratics by taking square roots: with stepsQuadratics by taking square roots: strategyStrategy in solving quadraticsQuadratic equations word problem: triangle dimensionsQuadratic word problem: ballWorked example: completing the square (leading coefficient ≠ 1)Worked example: quadratic formula (negative coefficients)Solving quadratics by taking square rootsCompleting the squareThe quadratic formulaSolving quadratics by factoringQuadratic equations word problem: box dimensionsSolving quadratics by completing the square: no solutionWorked example: quadratic formula (example 2)Solve by completing the square: Non-integer solutionsSolve by completing the square: Integer solutionsStrategy in solving quadratic equationsSolving quadratics by taking square roots examplesGraphing quadratics in factored formSolving quadratics by taking square roots: with stepsSolving quadratics by factoring: leading coefficient ≠ 1Worked example: Rewriting & solving equations by completing the squareQuadratics by taking square roots: strategy
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