3p + 3q - tp - tq = 3(p + q) - t(p + q) = (3 - t)(p + q)
36x^2 - (2 - x)^2 = 6x(6x) - (2 - x)(2 - x) = 6x(6x) - (2 - x)(2 - x) = (6x - 2 + x)(6x - 2 + x) = (4x + 2)(4x + 2)
3p + 3q - tp - tq = 3(p + q) - t(p + q) = (3 - t)(p + q)
36x^2 - (2 - x)^2 = 6x(6x) - (2 - x)(2 - x) = 6x(6x) - (2 - x)(2 - x) = (6x - 2 + x)(6x - 2 + x) = (4x + 2)(4x + 2)