Question

solve matrix qquestion2

Answer 1

here is your answer..

as

inverse of matrix= adj A

_____

|A|

so

for (ii)

adj A/ |A| = 4. -7

-1. 2

_______

1.

so answer = 4. -7

-1. 2

[ NOTE - this method of adjoint is ONLY FOR the competitive exams. not for BOARDS]

Answer 2

Answer:

Inverse of a matrix is $\frac{1}{ad - bc} *\left[\begin{array}{cc}d&-b\\-c&a\end{array}\right]$ if the matrix is $\left[\begin{array}{cc}a&b\\c&d\end{array}\right]$

1) inverse is $\left[\begin{array}{ccc}7&-3\\-2&1\end{array}\right]$

2) inverse is  $\left[\begin{array}{cc}4&-1\\-7&2\end{array}\right]$

3) inverse is $\left[\begin{array}{cc}1&-1\\-1&2\end{array}\right]$

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