Sal rewrites the equation y=-3x^2+24x-27 in vertex form (by completing the square) in order to identify the vertex of the corresponding parabola.
Key features of quadratic functions is a free educational video by Khan Academy.It helps students in grades 0 practice the following standards HSA.REI.B.4.a.
1. HSA.REI.B.4.a : Use the method of completing the square to transform any quadratic equation in xinto an equation of the form (x - p)2 = q that has the same solutions. Derive the quadratic formula from this form..
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