exam Maths Puzzle Numerical Ability

can i get help with this equation please?

x^2-96=0

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exam Other Question

solve the system:
{x+5y-z=4
{3x+4y+z=4
{x-y+z=0.
thanks for the help. I am haveing trouble with multiplying binomials using the FOIL method and useing squares, is there an easyer way to do this and how do I do squares?