sherrieasbury19
sherrieasbury19 sherrieasbury19
  • 21-05-2019
  • Mathematics
contestada

Help please............​

Help please class=

Respuesta :

sqdancefan
sqdancefan sqdancefan
  • 26-08-2019

Answer:

  (9x -2)(9x +2)

Step-by-step explanation:

Each of the terms in the difference is a perfect square, so the "perfect square trick" applies. The factors are the sum and difference of the square roots of the given terms.

  • √(81x²) = 9x
  • √4 = 2

  81x² - 4 = (9x +2)(9x -2)

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