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If x4 - 5x2 + 4 = 0; the values of x are :
1 or 2
± 1 or ± 2
-1 and 2
-2, -1, 1 or 2
Solve :
2x4 - 5x2 + 3 = 0
x4 - 2x2 - 3 = 0