For what value of x, the matrix A is singular? : `A=[(2,-3),(-1,x)]`

For what value of x, the matrix A is singular? : A=[(x,2,3),(0,2,3),(1,2,3)]

For what value of x, the matrix [(x,3),(x,2)] is singular?

If A=[(1,2,3),(0,-4,2),(0,0,7)] , for what values of x, the matrix A-xI_3 is singular?

For what value of x, the following matrix is singular [{:(50x,x+1),(2,4):}] .

For what value of x, frac(2x)(3) = 18 ?

For what value of a, [[2a, -1],[-8,3]] is a singular matrix ?

For what value of k, the matrix [[2-k, 3],[-5,1]] is not invertible ?

For what value of x, are the points (1, x), (2, 2x), (3, 3x) collinear ?

For what value of k, the function f given by f(x) = {(2x+1,x 2):} is continuous.

Examine whether A^2-2B is singular, given : A=[(-1,1,2),(3,0,4),(2,1,-2)] and B=[(2,-3,-4),(-1,0,-1),(0,-1,0)]