Axis of symmetry — Algebra I · Grade 9 or accelerated Grade 8, what it means and where it is taught
The vertical line through the vertex, x = -b2a.
Taught in Algebra I · Grade 9 or accelerated Grade 8.
Where it is taught
What it rests on
Work through these first if this one does not settle.
- Vertex — The turning point — the minimum if it opens up, the maximum if it opens down.
Practise this idea
2 questions in the course bank use Axis of symmetry, in Graphing Quadratics.
Problem 1
Find the axis of symmetry of y = x2 - 6x + 2.
Worked answer
x = 3
--62(1) = 3
x = 3
Problem 2
The roots of a parabola are -1 and 7. Find the axis of symmetry.
Worked answer
x = 3
-1 + 72 = 3
x = 3