1. (a+h)^2-4(a+h)

2. a^2-4a

3. (a+h)^2-4(a+h)-[a^2-4a] =2ah+h^2-4h

4.[2ah+h^2-4h]/h = 2a+h-4

5. if h tends to 0 we get : 2a-4

6. a = 3 : we get 2*3-4 = 2

Regards

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