(4c^4+1)-(7c^3-3)+(2c^4+5c^3)

6c^4 - 2c^3 + 4

Step-by-step explanation:

(4c^4 + 1) - (7c^3 - 3) + (2c^4 + 5c^3) =      ⇒ parenthesis4c^4 + 1 - 7c^3 + 3 + 2c^4 + 5c^3 =           ⇒ simplify, add up like terms6c^4 - 2c^3 + 4                                           ⇒ answer