Save guides, add subjects and pick up where you left off with your BBC account. \(y = x + 3\) is a linear equation and \(y = x^2 + 3x\) is a quadratic equation. If the product of two numbers is ...

David L. Russell, Controllability and Stabilizability Theory for Linear Partial Differential Equations: Recent Progress and Open Questions, SIAM Review, Vol. 20, No. 4 (Oct., 1978), ... Quadratic ...

Simultaneous equations with one linear and one quadratic - Higher tier. A linear equation close linear equation An equation where the maximum power of any variable is 1.