We have polynomial expression: E=x^4+4

Calculate x1 + x2 + x3 + x4

x1, x2, x3,x4 are the roots of the equation x^4+4=0

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We could use Viete expressions. They make the link between coefficients and roots in a given equation.

For example, if the equation is :

a*x^4 + b*x^3 + c*x^2 + d*x + e=0

x1 + x2 + x3 + x4=-b/a

In our equation, the coefficient b for x^3 is = 0, so

x1 + x2 + x3 + x4 = 0/1

x1 + x2 + x3 + x4=0

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