Question

Matrix help
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Answer 1

If the matrix is singular, then its determinant equals to zero. You can solve x...

Answer 2

i will get a value for x how do i get the "number of values"?

Answer 3

Take the determinant of this matrix, keeping the x variable. Set equal to zero. Determine what values of x make this determinant zero. Some of these x values will be in the range [-4,-1]. Count them.