6x^4-27x^2+12=0
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6х^4 - 27х^2 + 12 = 0 Х^2 = а ; а > 0 6a^2 - 27a + 12 = 0 D = 729 - 288 = 441 = 21^2 a1 = ( 27 + 21 ) : 12 = 4 a2 = ( 27 - 21 ) : 12 = 1/2 X^2 = a X^2 = 4 ; x = ( + - ) 2 X^2 = 1/2 ; x = ( + - ) V 1/2