Answer:
(a + b)(a + b - 2)
Step-by-step explanation:
(a + b)² - 2(a + b) ← factor out (a + b) from each term
= (a + b)(a + b - 2)
-6
Take a couple of differences and see:
11 -17 = -6
5 -11 = -6
The common difference is -6.
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A
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