Find an example of a 2x2 matrix

Find an example of a 2x2 matrix in case when B^2 = 0, although B is not the 0 matrix.

Please help!!! Thank you! :-)

B^2 = 0 is a 2X2 matrix of the form

|a b|
|-(a^2)/b -a|

so take any a and b and follow the form above, B^2 = 0

example
a = 4
and
b = 8

the matrix B would be [ 4, 8 | -2, -4]
|4 8| * |4 8| = |0 0|
|-2 -4| |-2 -4| |0 0|

and hence B^2 = 0

How exactly does B relate to the 2x2 matrix? Is this representing linear equations or non-linear?

huh?