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Answer: 2(3c^2+2)
Step-by-step explanation:
Get rid of the parentheses : 5c^2-2c+4 + c^2+2c
Combine any like terms: 5c^2-2c+4 + c^2+2c = 6c^2-2c+4 +2c
Combine like terms: 6c^2-2c+4 +2c = 6c^2+4
Then just factor by grouping: (5c^2-2c+4) + (c^2+2c) = 2(3c^2+2)