Question

what is the formula to find inverse matrices A..?example 2x2 matrices..
A=[2 5
1 4]

Answer 1

assuming you know determinants, its \[1/\det(a) *(d & -b \ -c & a) if A = (a & b \ c & d)\]

Answer 2

You can calculate them with Gauß elimination algorithm or in lower dimensional cases with Cramer's rule.

Answer 3

or just do
a b | 1 0
c d | 0 1
and put the left side in row reduced echelon form, doing the same operations to the right side. The right side is then the inverse.

Answer 4

thanks for info..now i can solve it...