![If A = begin{bmatrix}1 &lambda & 2 1 & 2 & 5 2 & 1 & 1end{bmatrix} is not invertible then lambda = ? If A = begin{bmatrix}1 &lambda & 2 1 & 2 & 5 2 & 1 & 1end{bmatrix} is not invertible then lambda = ?](https://haygot.s3.amazonaws.com/questions/1552583_1705785_ans_c72af12dc7be40c0960490bcb4adb235.jpg)
If A = begin{bmatrix}1 &lambda & 2 1 & 2 & 5 2 & 1 & 1end{bmatrix} is not invertible then lambda = ?
![matrices - Show that $A^{-1} + B^{-1}$ is invertible when $A,B$ and $A+B$ are invertible - Mathematics Stack Exchange matrices - Show that $A^{-1} + B^{-1}$ is invertible when $A,B$ and $A+B$ are invertible - Mathematics Stack Exchange](https://i.stack.imgur.com/xB1Ap.png)
matrices - Show that $A^{-1} + B^{-1}$ is invertible when $A,B$ and $A+B$ are invertible - Mathematics Stack Exchange
![Ex: Determine if a 3x3 Matrix is Invertible (nonsingular) Using a Determinant in 2023 | Graduate school, Matrix, Thing 1 Ex: Determine if a 3x3 Matrix is Invertible (nonsingular) Using a Determinant in 2023 | Graduate school, Matrix, Thing 1](https://i.pinimg.com/originals/14/27/a7/1427a79ff81fe9289466eff375bb990a.jpg)
Ex: Determine if a 3x3 Matrix is Invertible (nonsingular) Using a Determinant in 2023 | Graduate school, Matrix, Thing 1
![linear algebra - If A is invertible, then it can be represented as a product of elementary matrices. - Mathematics Stack Exchange linear algebra - If A is invertible, then it can be represented as a product of elementary matrices. - Mathematics Stack Exchange](https://i.stack.imgur.com/wB3kq.png)