A.8.A
Solve quadratic equations having real solutions by factoring, taking square roots, completing the square, and applying the quadratic formula.
Khan Academy ResourcesUnderstanding the quadratic formulaSolving quadratics by completing the squareSolving quadratics by factoring reviewQuadratic formula proof reviewCompleting the square reviewSolving simple quadratics reviewDiscriminant reviewSolving quadratics by taking square roots Quadratic formula reviewSolving quadratics by factoringQuadratic formulaQuadratics by factoring (intro)Completing the square (intermediate)Completing the squareQuadratics by factoringQuadratics by taking square rootsSolve equations by completing the squareCompleting the square (intro)Quadratics by taking square roots (intro)Quadratics by taking square roots: with stepsQuadratics by taking square roots: strategyWorked example: completing the square (leading coefficient ≠ 1)Worked example: quadratic formula (negative coefficients)Solving quadratics by taking square rootsCompleting the squareThe quadratic formulaProof of the quadratic formulaSolving quadratics by factoringWorked example: Completing the square (intro)Solving quadratics by completing the square: no solutionWorked example: quadratic formula (example 2)Using the quadratic formula: number of solutionsSolve by completing the square: Non-integer solutionsSolve by completing the square: Integer solutionsSolving quadratics by taking square roots examplesSolving 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: strategyWorked example: Rewriting expressions by completing the square
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