I?C K? NÂY P823. (M?c \( B \) ) Gi?i ph??ng trình sau trên t?p s? th?c \[ x^{4}-2 x^{3}-14 x^{2}+32 x-16=0 \text {. } \] Nguy?n ?úc Tu?ng, Gia Lai P824. (M?c \( B \) ) Cho \( a, b \) là các s? th?c d??ng th?a mãn \( a b \leq 1 \). Ch?ng minh r?ng \[ \frac{1}{a^{3}+b}+\frac{1}{b^{3}+a} \leq \frac{1}{a+b}+\frac{4}{(a+h)^{3}} \]
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Step 1: Solve the equation \( x^{4}-2 x^{3}-14 x^{2}+32 x-16=0 \) This equation can be rewritten as \( (x-2)^2 (x^2+4) = 0 \) So the solutions are \( x = 2, -2i, 2i \) Show more…
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