matt9327 matt9327
  • 01-05-2020
  • Mathematics
contestada

what expression represents the length of the rectangle?

what expression represents the length of the rectangle class=

Respuesta :

jimrgrant1 jimrgrant1
  • 01-05-2020

Answer:

9 + x

Step-by-step explanation:

81 - x² ← is a difference of squares which factors in general as

a² - b² = (a - b)(a + b), thus

81 - x²

= 9² - x² = (9 - x)(9 + x)

Area = length × width = 81 - x² = (9 - x)(9 + x)

Since width = 9 - x then length = 9 + x

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