(х²-6)(х²+2)=(х²-2)²-х
х⁴-6х²+2х²-12=х⁴-4х²+4-х
х⁴-х⁴-4х²+4х²+х=4+12
х=16
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(х²-6)(х²+2)=(х²-2)²-х
х⁴-6х²+2х²-12=х⁴-4х²+4-х
х⁴-х⁴-4х²+4х²+х=4+12
х=16