The Vertex-Sign Error
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
The vertex-sign error reads the vertex of (x + 3)² + 5 as (3, 5); the true vertex is (−3, 5).
Show
At x = 3, the function answers (3 + 3)² + 5 = 41, nowhere near a vertex; at x = −3, it bottoms at 5.
Watch for
Rewrite the inside as subtraction before reading h.
Builds on
- Nothing — this is a starting point.
Unlocks
- Nothing yet depends on this.