Algebra 2: Resources and Extra Practice - 2.06 Solving Quadratic Equations

Algebra 2: Resources and Extra Practice

2.06 Solving Quadratic Equations

Essential Question:

What methods can be used to solve quadratic equations?
How are solutions, roots, and x-intercepts of a quadratic related?

Lesson206.mp4

Lesson 2.06 Video - If the video does not load correctly, Click Here to watch.

Khan Academy Resources

Solving quadratics by factoringSal solves the equation s^2-2s-35=0 by factoring the expression on the left as (s+5)(s-7) and finding the s-values that make each factor equal to zero.

Solving quadratics by factoring: leading coefficient ≠ 1Sal solves 6x²-120x+600=0 by first dividing by 6 and then factoring.

Worked example: quadratic formula (example 2)Sal solves the equation -x^2+8x=1 by first bringing it to standard form and then using the quadratic formula.

Using the quadratic formula: number of solutionsSal determines how many solutions the equation x²+14x+49=0 has by considering its quadratic formula, and more specifically, its discriminant.

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