\(\frac{4 x^{2} +20x+25}{2x+5} \\ \frac{(2x+5)(2x+5)}{2x+5} \\ 2x+5\)
Simplified, it is equal to 2x+5.
To get your answer, you factor the numerator. Then, when you get (2x+5)²/(2x+5), you cancel out one of the 2x+5 in the numerator with the one in the denominator and get your answer.
Hope this helps!