book Maths Puzzle Numerical Ability

x^4 - 3x^2 + 2 = 0

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book Other Question

Solve the following system by using the Gauss-Jordan Method:

6 3 -1 : 5
-5 -6 7 : -6
4 -4 9 : 2 5-1/2(x-6)=4 I know that x=8,I`m confused on how to break it down