Respuesta :

merue

Answer:

C

Step-by-step explanation:

  • (a+b)² = a² + 2ab  + b²
  • example : (5+2)² = 5² + 2.5.2 + 2²  = 49

9x² + 6x + 1

9x²  = (3x)²

1 = 1²

6x = 2.3x.1

So => 9x² + 6x + 1 => (3x + 1)²

Hope this helps ^-^