а) x^2 + 4x + 1 = (x^2 + 4x + 4) - 3 = (x + 2)^2 - 3б) y^2 + 2y = (y^2 + 2y + 1) - 1 = (y + 1)^2 - 1в) -b^2 + 6b - 8 = (-(b^2 - 6b + 9)) + 1 = (-(b - 3)^2) + 1
а) x^2 + 4x + 1 = (x^2 + 4x + 4) - 3 = (x + 2)^2 - 3
б) y^2 + 2y = (y^2 + 2y + 1) - 1 = (y + 1)^2 - 1
в) -b^2 + 6b - 8 = (-(b^2 - 6b + 9)) + 1 = (-(b - 3)^2) + 1