Answer:
first option
Step-by-step explanation:
Given
[tex]\frac{3x}{x+1}[/tex] ÷ x + 1 = [tex]\frac{3x}{x+1}[/tex] ÷ [tex]\frac{x+1}{1}[/tex]
To perform the division
Leave the first fraction, change division to multiplication and turn the second fraction upside down, that is
= [tex]\frac{3x}{x+1}[/tex] × [tex]\frac{1}{x+1}[/tex]
