exam Maths Puzzle Numerical Ability

Whats the solution for (-x|x|)1/2.(1/2 is square root power)

I answered x but the solution says -x

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exam Other Question

For a number of two digits, the sum of its digits is equal to 1/7th of the number and the product of its digits is equal to 10 less than half the number. The number is: Which describes the number and type of roots of the equation x(squared)-625=0?