(m-2)^2-(m+1)(m-3) = m^2 - 4m + 4 - (m^2 - 3m + m - 3) = m^2 - 4m + 4 - m^2 + 2m + 3 = -2m + 7
5(d-c)^2 + 10dc = 5(d^2 - 2dc + c^2) + 10dc = 5d^2 - 10dc + 5c^2 + 10dc = 5d^2 + 5c^2
x^3 + (2-x)(x^2 + 2x + 4) = x^3 + 2x^2 + 4x - x^3 - 2x^2 - 4x = 0
(m-2)^2-(m+1)(m-3) = m^2 - 4m + 4 - (m^2 - 3m + m - 3) = m^2 - 4m + 4 - m^2 + 2m + 3 = -2m + 7
5(d-c)^2 + 10dc = 5(d^2 - 2dc + c^2) + 10dc = 5d^2 - 10dc + 5c^2 + 10dc = 5d^2 + 5c^2
x^3 + (2-x)(x^2 + 2x + 4) = x^3 + 2x^2 + 4x - x^3 - 2x^2 - 4x = 0