Your answer was incorrect
A 90 ° rotation clockwise about the origin has the tranformation formula :
(x, y) ⇒ ( y, -x)
So
(5, -2) would become ( -2, -5)
(3,2) would become (2, -3)
(0,0) would become (0, 0)
(-2, -4) would become ( -4, 2)
But your transformed points should be for a -90° rotation [ = a 270° rotation ]
(2,5) (-2,3) (0, 0) and ( -4, -2)
Which are the points on your transformed matrix