In this paper we use a diagonal matrix for getting the Binet’s formula for
k-Pell sequence while for the k-Pell-Lucas sequence, we adopt the process
considered by Catarino and Vasco, in [14]. Also we stated two identities involving
the sequences and use them in the last section when we establish the nth power of
the generating matrix for k-Pell-Lucas sequence. Finally, some basic properties
involving the determinant of this matrix allow us to obtain the Cassini’s identity for
k-Pell-Lucas sequence.