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krwlz, this question is relatively easy to solve. since you probably wanna try by yourself, here\'s some hint:
you know x is a 2x2 matrix, because A and B both are: [2x2] [2x2] = [2x2].
Now let the elements of X be:
(a b)
(c d)
now we have:
(-1 2) (a b) = (1 2)
(2 -4) (c d) (3 5)
use the multiplication rules for matrix multiplication and you will have four equations with four unknowns to solve (a, b, c, d), which is very easy to do. Try it, and let me know if you still have trouble.
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