book Maths Puzzle Numerical Ability

I need help solving this quadratic equation:
(x-2)^2+x^2=10

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book Other Question

Samantha is 8 and two-third older than John. The sum of their ages is 23 years. How old is John? if order does matter, how many ways can you interview the 17 volunteers 3 at a time?

please help me with this question