Linear Algebra and Quadratic Equations I'm just wondering if Linear Algebra is concerned only with Linear equations? Can quadratic equations(or any higher power) also be considered under Linear Algebra? What does the term Linear stand for?

Linear algebra very much  included Quadratic equations. in fact. Polynomial equations of any degree.  For example $ax^2+bx+c=0$ may be written as product of a row vector $(a, b, c)$ with a column vector $(x^2,x,1)^\top$.
