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Consider the polynomial$$f(x) = 1 + 2x + 3x^2 + 4x^3$$.Let s be the sum of all distinct real roots of f(x) and let $$t = \mid s \mid$$.
The real numbers lies in the interval
$$\left(-\frac{1}{4}, 0\right)$$
$$\left(-11, -\frac{3}{4}\right)$$
$$\left(-\frac{3}{4}, -\frac{1}{2}\right)$$
$$\left(0, \frac{1}{4}\right)$$
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