Question

Find the derivative of the function from the first principle F(x)=(x+1)(x+2)

Answer 1

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$\longrightarrow \sf f(x) = (x+1)(x +2) \\ \\\longrightarrow \sf f(x) = {x}^{2}+2x +x + 2 \\ \\\longrightarrow \sf f(x) = {x}^{2}+3x + 2 \\ \\ \longrightarrow \boxed{\sf f'(x) = 2x+3}$