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a = 1
b = -8
c = 2p + 2
b² - 4ac = 0
(-8)² - 4(1)(2p + 2) = 0
64 - 8p - 8 = 0
-8p = -64 + 8
-8p = -56
p = -56/-8
p = 7
p² + p = 7² + 7
= 49 + 7
= 56