Linear AlgebraMediumRow Reduction & Rank ShareRow Reduction & Rank · Medium problemWhat is the rank of M=(312221−3−9−1−150000)M = \begin{pmatrix}3 & 12 & 2 & 21 \\ -3 & -9 & -1 & -15 \\ 0 & 0 & 0 & 0\end{pmatrix}M=3−3012−902−1021−150?Check Show answer Walk through it step by step Practice more like this Review this concept