There is a parent parabola,which is stretch horizontally by a factor of 2 and vertically by a factor of 6,and shifted 7 units to the left then 8 units downwards.What is the equation of the resultant f...有一个抛物线的母函数（最简单形式），被横向拉长2倍，纵向拉长6倍，向上平移8个单位，向左平移7个单位。由以上步骤得到的新函数图形的解析式是？