exam Maths Puzzle Numerical Ability

sqrt(-3-5)sqrt2+(-4-2)sqrt2 this is supposed to add up to sqrt100 and then into 10 how is this problem done?

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exam Other Question
Find the center and radius by completing the square.
x^2+y^2+10x+7=0 Find the equation of a circle with center (2,4) that passes through (1,7).