exam Maths Puzzle Numerical Ability

Diagonal brace. The width of a rectangular gate is 2 meters lager than its height. The diagonal braces measure "radical" 6. Find the width and height

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exam Other Question
8*k^2+5*k=2*k^2+4


Thanks for the help,
Chris When simplifying a radical, is it necessary to take the absolute value of a result to indicate the principal root?