exam Maths Puzzle Numerical Ability

Please help...my original problem is: 2(x-5)^2 = 3.

I think the answer is: x= 10 (plus/minus) sq.rt.6 / 2....am I on the right track?

Thank you for your help!

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exam Other Question

What operation used in the algebraic expression xyz2? 2, 5, 8, 11. whats the sum of first 50 terms.