Level:
Project ID:
2000017104
Accepted:
0
Clonable:
0
Easy:
0
Find the number \(a\) so that the matrices given below are inverse to each other.
\[
\left (\array{
1& 2 \cr
2 & 2 \cr} \right ),
~
\left (\array{
-1& 1 \cr
1 & a \cr} \right )
\]
\(a=-\frac12\)
\(a=\frac12\)
\(a=0\)
\(a\) cannot be found.
Fixed Answer:
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