Question

2) f(x)=(x + 1)' (x + 2). Помогите решить ​

Answer 1

$f(x)=(x+1)(x+2)\\f'(x)=(x+1)'(x+2)+(x+1)(x+2)'\\f'(x)=x+2+x+1\\f'(x)=2x+3$