How does one find a basis for a set of polynomials?

**superdude** · March 23rd 2010, 11:19 AM

For example determine the basis for span S={ $t-2,2t-1,4t-2,t^2-t+1,t^2+2t+1$ }

how would I do it if I do/do not want the basis to be a subset of S?

I know that if I want it to be a subset then I put the matrix $\left[ \begin{array}{cccc}<br /> 0 & 0 & 1 & 1 \\<br /> 1 & 2 & -1 & 2 \\<br /> -1 & -2 & 1 & 1<br /> \end{array} \right]$ into reduced row echelon forum which gives $\left[ \begin{array}{cccc} 1 & 2 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array} \right]$

and I don't know where to go from here.

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