а)2c (1+c)-(c-2)(c+4)

Question

а)2c (1+c)-(c-2)(c+4)

Answer 1

2c + 2c^2 - (c^2 + 2c - 8) = 
= 2c + 2c^2 - c^2 - 2c + 8 = 
= 2c^2 - c^2  + 8 = 
= c^2 + 8