Question

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$x {}^{4} + x{}^{2} - 2 = 0$

Answer 1

x⁴ + x² - 2 = 0 => b/c= 1/-2 = 2-1 /2•-1

(x²+2) . (x²-1) = 0

(x²=-2). (x²=1)

x= { } . x=±1. <=====©