$$ x^4 - 3x^2 = 1 \le x^4 - 3x^4 + x^4\\ x^4 - 3x^2 = 1 \le -x^4\\ $$ Is $-x^4 = (-x)(-x)(-x)(-x)$ or $-(x^4)$?
2026-03-31 12:09:10.1774958950
Is $-x^4 = (-x)(-x)(-x)(-x)$ or $-(x^4)$?
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$$(-x)^4=x^4$$ Whereas $$-x^4=-(x^4)$$ The appearance of () changes the answer