Mathematics for IGCSE & O level - Graphs Of Functions (Section 1 - No. 9)
If you are given the roots of a quadratic equation, and you want to sketch the graph, which information helps you find the y-intercept?
The axis of symmetry
The value of a.
The vertex
The x-intercepts
คำอธิบาย
Knowing 'a' and the roots allows to calculate the equation, from which you can find the y-intercept.