а) (a + 6)2 – 2a (3 – 2a) = a^2 + 12a + 36 - 6a + 4a^2 = 5a^2 + 6a + 36б) (x-3)(x+2)-(x-2)(x+2) = x^2 - x - 6 - x^2 + 2x + 4 = x - 2
а) (a + 6)2 – 2a (3 – 2a) = a^2 + 12a + 36 - 6a + 4a^2 = 5a^2 + 6a + 36
б) (x-3)(x+2)-(x-2)(x+2) = x^2 - x - 6 - x^2 + 2x + 4 = x - 2