Question
$$(x^2+3)^4 = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} (x^2+3)^4 &= 0&& \text{simplify left side} \\[1 em]x^8+12x^6+54x^4+108x^2+81 &= 0&& \\[1 em] \end{aligned} $$
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using Newton method.
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