Axis of Symmetry

The axis of symmetry is the vertical line that divides a parabola into two mirror-image halves and passes through its vertex. For $y=ax^{2}+bx+c$ its equation is $x=-\frac{b}{2a}$.

Points at equal horizontal distances from this line share the same $y$-value.

You meet Axis of Symmetry in the Quadratic Functions chapter of SPM Additional Mathematics. Knowing the term precisely matters in the exam: questions often hinge on reading a keyword correctly, and because SPM marking is analytic, using the right definition in your working helps secure method marks.

Our teachers make sure a student can not only recite what Axis of Symmetry means but use it fluently in a full solution.

Because the SPM Add Math paper is bilingual (BM/EN), it helps to know this term in each language: Axis of Symmetry (EN) · Paksi Simetri (BM) · 对称轴 (中文)

Other key terms from the Quadratic Functions chapter you may want to check:

• Quadratic Equation
• Discriminant
• Completing the Square
• Roots of a Quadratic Equation
• Vertex Form
• Quadratic Inequality