Respuesta :

Answer:

9x² + 42x + 49

Step-by-step explanation:

Identity

  • (x + a)² = x² + 2ax + a²

In this case, x = 3x and a = 7, so substitute the values.

  • (3x + 7)²
  • (3x)² + 2(3x)(7) + (7)²
  • 9x² + 42x + 49
igoroleshko156

Answer:

[tex]9x^2 + 42x + 49[/tex]

Step-by-step explanation:

Step 1:  Factor out the expression

[tex](3x + 7)^2[/tex]

[tex](3x + 7)(3x + 7)[/tex]

[tex](3x * 3x) + (3x * 7) + (7 * 3x) + (7 * 7)[/tex]

[tex]9x^2 + 21x + 21x + 49[/tex]

[tex]9x^2 + 42x + 49[/tex]

Answer: [tex]9x^2 + 42x + 49[/tex]

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