Question

Linear algebra.
For what values of c does
A= 1 0 -c
-1 3 1
0 2c -4 have an inverse?

Answer 1

matrix A has and inverse when determinant isn't equal to zero so....try to solve determinant of the matrix and solve it for c, and you'll get c is not equal to some value and that will be your answer

Answer 2

row reducing is another method