book Maths Puzzle Numerical Ability

I'm not sure how to get 3 over 5-the square root of 2
Could you help me? thanks!

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book Other Question

cubed root of -243x^3y^10 Solve the following system by using the Gauss-Jordan Method:

-8 -1 -7 : -2
6 -4 1 : -3
8 -5 2 : -7