а) 4(1 + 3x)^2 - 24x = 4(1 + 6x + 9x^2) - 24x = 4 + 24x + 36x^2 - 24x = 36x^2 + 24x + 4
б) (x + 4)(x - 4) - (x - 3)^2 = (x^2 - 16) - (x^2 - 6x + 9) = x^2 - 16 - x^2 + 6x - 9 = 6x - 25
а) 4(1 + 3x)^2 - 24x = 4(1 + 6x + 9x^2) - 24x = 4 + 24x + 36x^2 - 24x = 36x^2 + 24x + 4
б) (x + 4)(x - 4) - (x - 3)^2 = (x^2 - 16) - (x^2 - 6x + 9) = x^2 - 16 - x^2 + 6x - 9 = 6x - 25