book Maths Puzzle Numerical Ability

what happens if you have x squared times x squared?

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Hello. The problem is cube root of 10/9x^2. I have come up with the cube root of 30x/3x. Can someone please verify if I have the correct answer? Thanks in advance. Find all matrices with real number elements, which are the square root of:

matrix: 1 -1
-1 1