Answer:
C
Explanation:
Unit Test Is a pain I know
see explanation
81 - 100 ← is a difference of squares which factors in general as
a² - b² = (a - b)(a + b)
81 = (9a³ )² ⇒ a = 9a³ and 100 = 10² ⇒ b = 10
Hence
81 - 100
= (9a³)² - 10²
= (9a³ - 10)(9a³ + 10)
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- 100 ← is a difference of squares which factors in general as = (9a³ )² ⇒ a = 9a³ and 100 = 10² ⇒ b = 10 - 100