Question

抛物线顶点与对称轴的公式的推导过程,

Answer 1

y=ax^2+bx+c

=a(x^2+b/ax)+c

=a{[x^2+b/ax+(b/2a)^2]-(b/2a)^2}+c

=a(x-b/2a)^2+c-b^2/4a