Respuesta :

5x(x+4)

Step by step

5x^2 = 5x(x) because it’s the largest you can divide by
20x =4 because 5x times by 4 = 20x
Which means 5x^2+20x = 5x^2+20x= 5x(x+4)

Answer:

5x(x+4)

Step-by-step explanation: