2 + (B + 2)2 + (c + 1)2 = 0 a 1 = 0 a = 1;b + 2 = 0 b = 2c + 1 = 0 c = 1 2a 3b + 7C= 2 3 ( 2) + 7 ( 1)= 2 + 6 7 = 1