Respuesta :

muhayminulh

Answer:

x² + 80x - 5

Step-by-step explanation:

  1. x (x+ 20) (4x-5)
  2. x [tex]*[/tex] x = x²
  3. x [tex]*[/tex] 20 = 20x
  4. x² + 20x [tex]*[/tex] 4x - 5
  5. 20x [tex]*[/tex] 4x = 80x
  6. so in all = x² + 80x - 5