(初三数学)在平面直角坐标系xOy中,已知抛物线y=a{x}^{2}+4ax+c(a≠0)经过A(0,4),B(-3,1)两点,顶点为C.(1)求该抛物线的表达式及点C的坐标(2)将(1)中求得的抛物线沿y轴向上平移m(m>0)个单

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