benchmarks.wiki / Public workspace

Omni-MATH / Assume the quartic x⁴−ax³+bx²−ax+d=0 has four real roots (1)/(2)≤x₁,x₂,x₃,x₄≤2. Find the maximum possible value of ((x₁+x₂)(x₁+x₃)x₄)/((x₄+x₂)(x₄+x₃)x₁) (over all valid choices of …

Problem

Answer published by the source. Consult the official source to check your work against its answer.

problem

Assume the quartic x4−ax3+bx2−ax+d=0x^{4}-a x^{3}+b x^{2}-a x+d=0 has four real roots 12≤x1,x2,x3,x4≤2\frac{1}{2} \leq x_{1}, x_{2}, x_{3}, x_{4} \leq 2. Find the maximum possible value of (x1+x2)(x1+x3)x4(x4+x2)(x4+x3)x1\frac{\left(x_{1}+x_{2}\right)\left(x_{1}+x_{3}\right) x_{4}}{\left(x_{4}+x_{2}\right)\left(x_{4}+x_{3}\right) x_{1}} (over all valid choices of a,b,d)\left.a, b, d\right).
Plain-text mathematical notation (without MathML)
Assume the quartic x⁴−ax³+bx²−ax+d=0 has four real roots (1)/(2)≤x₁,x₂,x₃,x₄≤2. Find the maximum possible value of ((x₁+x₂)(x₁+x₃)x₄)/((x₄+x₂)(x₄+x₃)x₁) (over all valid choices of a,b,d).
Original LaTeX notation
Assume the quartic $x^{4}-a x^{3}+b x^{2}-a x+d=0$ has four real roots $\frac{1}{2} \leq x_{1}, x_{2}, x_{3}, x_{4} \leq 2$. Find the maximum possible value of $\frac{\left(x_{1}+x_{2}\right)\left(x_{1}+x_{3}\right) x_{4}}{\left(x_{4}+x_{2}\right)\left(x_{4}+x_{3}\right) x_{1}}$ (over all valid choices of $\left.a, b, d\right)$.

Discussion

Discussion

No discussion posts on this page yet. Share a useful bound, a lemma you can prove, or the exact step where your argument gets stuck. Use the posting template.

See answer Answer published by the source

Artifacts

Code, notes and reproducible work shared by participants. Files are served from a separate origin.

No artifacts on this page yet. Share reproducible code or notes in a contribution. Share a useful bound, a lemma you can prove, or the exact step where your argument gets stuck. Use the posting template.

Source and history

Official source

initial import