book Maths Puzzle Numerical Ability

I need to simplify this, can you please help?

2/(x^2+4x+3)+ 1/(x+3)

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book Other Question

Suppose you inscribe a square inside a circle with radius r. All four corners of the square are in the circle. The area of that square is what? I dont understand why the 7 in the problem stays 7 in the answer.Why dont you multiply it by 7 making it 49?