Which expression is in simplified form for the given expression and states the correct variable restriction u+3/u^2-9

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Simplifying the expression given we shall have: (u+3)/(u²-9) factorizing (u²-9)=(u-3)(u+3) thus plugging the substitute in the expression we shall have: =(u+3)[(u-3)(u+3]) =1/(u-3) Hence the answer is 1/(u-3) u can take any values except 3.

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