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podryga [215]
3 years ago
7

A) n(n + 2) 224b)x² + x = 156​

Mathematics
1 answer:
Molodets [167]3 years ago
8 0

Step-by-step explanation:

b)

{x}^{2}  + x - 156 = 0 \\ (x + 13)(x - 12) = 0 \\ x =  - 13 \\ or \\ x = 12

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