der the matrix A ments are true? = 1 X X 5 4 X 21 X 3 . Which of the following A is invertible for all values of x. A is invertible for all x>0. A is invertible for all x<-4. A is singular (that is, not invertible) for exactly one value of x. A is singular (that is, not invertible) for exactly two values of x.

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