Answer:
[tex] \frac{3x}{ {(x + 1)}^{2} } [/tex]
Step-by-step explanation:
[tex] (\frac{3x}{x + 1}) \div (x + 1) \\ \\ = \frac{ \frac{3x}{x + 1} }{x + 1} \\ = \frac{ \frac{3x}{x + 1} }{ \frac{x + 1}{1} } \\ = \frac{3x \times 1}{(x + 1) \times (x + 1)} \\ = \frac{3x}{ {(x + 1)}^{2} } [/tex]
