Grade 9 · Math
Read a quadratic’s vertex form practice
Find the vertex’s x-coordinate from a completed-square expression.
Opening your practice adventure…
Try a sample
For y = (x − 4)2 + 1, what is the x-coordinate of the vertex?
- 5
- 4
- 6
- 3
See the answer & why
4
The squared term is zero when x = 4. The vertex is (4, 1), so its x-coordinate is 4.
A little hint: In y=(x−h)2+k, the vertex is (h,k).
A teaching tip
Find the x-value that makes the squared expression zero.