book Maths Puzzle Numerical Ability

18bsquareda-4ba+7absquare

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book Other Question

are you supposed to simplify your solution to a proportion after cross-multiplying? Sorry, I don't even know what subject this problem is in AND I can't figure out how to get the caret symbol:

x exp.3+ 4x exp. 2 y + 4xy exp. 2 + 2xy - 6y exp. 2 /(divide)x + 2y