exam Maths Puzzle Numerical Ability

(X^2 + 2xy +Y^2)-49

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Please help me to understand how to do this...it doesn`t make sense to me. Thank you so very much in advance for helping me. Here is the problem:

3^w * 3^5-w * 3

Thank Add 3c2 + 7c + 1 and 10c2 - 8c - 4.