1) 50a²-(7a-1)² = 50a² - (49a² - 14a + 1) = 50a² - 49a² + 14a - 1 = a² + 14a - 1
2) c²+36-(c-6)² = c² + 36 - (c² - 12c + 36) = c² + 36 - c² + 12c - 36 = 12c
3) (x-2)²+x(x+10) = x² - 4x + 4 + x² + 10x = 2x² + 6x + 4
1) 50a²-(7a-1)² = 50a² - (49a² - 14a + 1) = 50a² - 49a² + 14a - 1 = a² + 14a - 1
2) c²+36-(c-6)² = c² + 36 - (c² - 12c + 36) = c² + 36 - c² + 12c - 36 = 12c
3) (x-2)²+x(x+10) = x² - 4x + 4 + x² + 10x = 2x² + 6x + 4