book Maths Puzzle Numerical Ability

aw^2-8b+2bw^2-4a

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I have a right triangle with one known angle in addition to the right angle and the length of the side (b) between these two angles. The length of side (b) is five. How do I find the length of side (a)? Side (c) is also unknown. Evaluate. 4 � 2^2 - 2 � 8