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Let f(x)=x^2+b x+c ,w h e r eb ,c in Rd...

Let `f(x)=x^2+b x+c ,w h e r eb ,c in Rdot` If `f(x)` is a factor of both `x^4+6x^2+25 and 3x^4+4x^2+28 x+5` , then the least value of `f(x)` is: (a.) `2` (b.) `3` (c.) `5//2` (d.) `4`

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