Respuesta :

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The answer should be 31.20 :)

Answer:

51 - 14√2

Step-by-step explanation:

Identity used :

  • (a - b)(a - b) = (a - b)² = a² - 2ab + b²

Solving :

  • (7 - √2)(7 - √2)
  • (7 - √2)²
  • (7)² - 2(7)(√2) + (√2)²
  • 49 - 14√2 + 2
  • 51 - 14√2