Recent content by drestupinblac

Oops, instead of "LY" I meant to put "LU" anyone? or if the question doesn't make sense, can you please tell me so I can re-phrase?

Q: Find the LY-factorization of the matrix A = \begin{bmatrix} a & b \\ c & d \\ \end{bmatrix} that has 1's along the main diagonal of L. Are there any restrictions on the matrix A? My attempt at an answer: L = \begin{bmatrix} 1 & 0 \\ e & 1 \\ \end{bmatrix} U = \begin{bmatrix}...

Thank you for the warm welcome :) The answer seems almost obvious now that I see it, I guess I didn't think it would be as easy as choosing values for x.

Q: Show that if ax^2 + bx + c = 0 for all x, then a=b=c=0 Please help, I'm just starting out in Linear Algebra and I'm not sure how to even start going about proving this. Thanks!