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  • 04-09-2019
  • Mathematics
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If xy = a and x2 + y2 = b, which of the following is equivalent to 9b – 18a ?
A) (3x – 3y)2
B) (3x – 6y)2
C) (9x – 9y)2
D) (9x – 18y)2

Respuesta :

sqdancefan
sqdancefan sqdancefan
  • 05-09-2019

Answer:

  A)  (3x -3y)²

Step-by-step explanation:

9b -18a = 9(x² +y²) -18xy

  = 9x² -18xy +9y²

  = (3x -3y)² . . . . . matches choice A

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