а) (x + 3)(x - 5) = x^2 - 2x - 15
б) (x - 4)(x + 5) = x^2 + x - 20
в) x(x - 6) = x^2 - 6x
г) 4x(x + 3) = 4x^2 - 3x
д) (x - (1 + 3в))(x - (1 - 3в)) = (x - 1 - 3в)(x - 1 + 3в) = x^2 - 2x + 1 - 9в^2
е) (2x - 1)(x + 1/2) = 2x^2 + x - 1
а) (x + 3)(x - 5) = x^2 - 2x - 15
б) (x - 4)(x + 5) = x^2 + x - 20
в) x(x - 6) = x^2 - 6x
г) 4x(x + 3) = 4x^2 - 3x
д) (x - (1 + 3в))(x - (1 - 3в)) = (x - 1 - 3в)(x - 1 + 3в) = x^2 - 2x + 1 - 9в^2
е) (2x - 1)(x + 1/2) = 2x^2 + x - 1