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1 year ago in Algebra , Applied Mathematics By Suresh

How can a system of simultaneous equations containing cubic and quadratic equations be solved?

In my research on dynamical systems, I often encounter models that couple equations of different orders. I'm looking for a reliable, step-by-step approach beyond just using a computational black box, as I need to interpret the intermediate steps for my analysis.

 

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By Manasa Answered 10 months ago

From my work in computational physics, I've seen these mixed systems arise frequently, especially in equilibrium problems. I would recommend starting not by solving each separately, but by using substitution to reduce the system's degree. Isolate a variable from the simpler quadratic, substitute it into the cubic, and solve the resulting higher-order single equation. This algebraic approach often reveals structural relationships. For complex systems, I then use numerical solvers like Newton-Raphson, but always cross-verify with the analytical groundwork to catch spurious solutions.

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