Question

cheek whether the following matrices are invertible or not ( 1 2 3 ;2 -1 3 )
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Answer 1

Answer:

a 2×2 matric is invertible only when it's determinent is not equal to zero.

but in given question matrix is 2×3

we can find determinent of only that matrices which are square matrix.

but we can solve this question by another method

and verify by finding its rank

first we should reduce this matrix in Echlon form

then we can easily find rank

rank of given matrix is 2

it's means it is invertible