抛物线Y=ax2+bx+c过点(-3 2)(-1 -1)(1 3)求解析式

问题描述:

抛物线Y=ax2+bx+c过点(-3 2)(-1 -1)(1 3)求解析式

将三点坐标代入抛物线方程得:9a-3b+c=2···························1a-b+c=-1·····························2a+b+c=3·················...