book Maths Puzzle Numerical Ability

Hey! Could you please help me with this problem? I think it's dealing with vertex and quadratic functions. It would help if you could explain the answer step by step. Thanks so muc

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Please help me solve this problem (2x2 matrix)
If A=[1 -2, 1 0] and AB=[1 0, -1 2]Find B.

I tried multiplying A*AB changing the signs of AB but the answer did not come out right.
Answer should be B=[-1 0, -1 1] I am trying to solve a problem relating the volume to the surface area of a sphere. I got this far and cannot finish it. Can you please help me? Thank you.

v=4/3pi*(s/4pi)**3/2