Which of the numbers -3 -2 -1 0 1 2 3 are the roots of the equation 1 x^4-5x^2+4=0 2 x^2 x+1 + x+4 =4?

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Which of the numbers -3 -2 -1 0 1 2 3 are the roots of the equation 1 x^4-5x^2+4=0 2 x^2 x+1 + x+4 =4? and got a better answer

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Response from 0[+++++]
+2, -2, +1, -1

 

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