Question

Select the correct answer. Which is the inverse of this matrix? 1 2 5 35 9 11 -2. A. -19 9 - 71 15 -7 6 -2 1 -199 -2 1 15 -7 -7 6 B. Oc. [152 7 0 ] OD. - 19 15 - 7 -2 1 O E. The matrix is noninvertible.

Answer 1

We will have that the inverse of the matrix will be the following:

$A=\mleft[\begin{array}{ccc}1 & 2 & 5 \\ 3 & 5 & 9 \\ 1 & 1 & -2 \\ \end{array}\mright]$$A^{-1}=\mleft[\begin{array}{ccc}-19 & 9 & -7 \\ 15 & -7 & 6 \\ -2 & 1 & -1 \\ \end{array}\mright]$