At about the 1:18 mark, the teacher writes on the board that b/2 is (1/2)/2, but he should have written (-1/2)/2.
At about the 2:22 mark, the teacher writes that b/2=1/4; he should have written b/2=-1/4
In this lesson, the teacher explains how to complete the square by factoring out a two. The teacher shows how to write the function as a perfect square trinomial and how to find the vertex. Additionally, the teacher briefly explains how to solve the equation using the quadratic formula.
Completing the square by factoring out a two
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