(3t-11x)² = 9t² - 66tx + 121x²
(13-t)(13+t)² = (13-t)(169+26t+t²) = 169 - 13t + 169t - 26t² + 169t² - 26t³ = 169 + 156t + 342t² - 26t³
(3c+11k)(3c-11k)² = (3c+11k)(9c² - 66ck + 121k²) = 27c³ + 363c²k - 198ck² + 1331k³
(3t-11x)² = 9t² - 66tx + 121x²
(13-t)(13+t)² = (13-t)(169+26t+t²) = 169 - 13t + 169t - 26t² + 169t² - 26t³ = 169 + 156t + 342t² - 26t³
(3c+11k)(3c-11k)² = (3c+11k)(9c² - 66ck + 121k²) = 27c³ + 363c²k - 198ck² + 1331k³