爱上海后花园

已知函数f(x)的系数为a,(a>0)且方程f(x)=-2的两个实数根为1和3,若方程f(x)+6a=0有两个不等实根,求f(x)解析式

1fx=ax^2bxca0fx2xgx=ax^2b2xc0x1x2gxx1x2=b2a=4x1x2=ca=3b=24ac=3afx6a=ax^224ax3a6a=ax^224ax9a;fx6a=0=24a^236a^2=0a=15fx=15x^265x352fx=ax^224ax3aa0x=24a2afxfx=a^24a1a0a^24a1023a23...

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