Find the inverse of the matrix using row operations.
[
2
−
1
7
4
]
\displaystyle {\left[\begin{array}{cc} {2}&-{1}\\{7}&{4}\end{array}\right]}
[
2
7
−
1
4
]
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Enter your answer as a matrix, like [(2,3,4),(1,4,5)]
Enter each element of the matrix as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)