The inverse of is ... (a) (1/2) ((2,-1),(-4,2)) (b) ((2,-1),(-4,2)) (c) ((2,1),(4,2)) (d) Inverse does not exist

Question

The inverse of \(\begin{pmatrix} 2&1 \\[0.3em] 4&2 \\[0.3em] \end{pmatrix} ​\)is ...
(a) (1/2) \(\begin{pmatrix} 2&-1 \\[0.3em] -4&2 \\[0.3em] \end{pmatrix}\)

(b) \(\begin{pmatrix} 2&-1 \\[0.3em] -4&2 \\[0.3em] \end{pmatrix}\)

(c) \(\begin{pmatrix} 2&1 \\[0.3em] 4&2 \\[0.3em] \end{pmatrix} ​\)

(d) Inverse does not exist

Answer 1

(d) Inverse does not exist