Expand -(3 - c)(c + 2(3 - c) + 5c - 7).What is the sum of the coefficients of the expanded form?
-(3 -c) ( c + 2(3-c) + 5c - 7) =
-(3 -c) ( c + 6 - 2c + 5c - 7) =
-(3 -c) ( 4c - 1) =
(c - 3) (4c -1) =
4c^2 - 12c -1c + 3 =
4c^2 -13c + 3
Sum of coefficients = 4 -13 = -9
