An algebra problem by Razif FA

Algebra Level 2

$\dfrac{x^2-1}{x+1} + \dfrac{(x+1)^2-1}{x+2} + \dfrac{(x+2)^2-1}{x+3}$

Given that $x>0$ , the expression above simplifies to:

3x

(x+1)^2

(x-1)^2

3(x-1)^2

3x-1

1

3(x+1)^2

3x+1