K(x) = (3x - 1)(3x + 1) + (3x + 1)(x - 3) = (3x + 1)(3x - 1 + x - 3) = (3x + 1)(4x - 4) = 4(3x + 1)(x - 1).
L(x) = (x - 1)(3x - x - 1) = (x - 1)(2x - 1).
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K(x) = (3x - 1)(3x + 1) + (3x + 1)(x - 3) = (3x + 1)(3x - 1 + x - 3) = (3x + 1)(4x - 4) = 4(3x + 1)(x - 1).
L(x) = (x - 1)(3x - x - 1) = (x - 1)(2x - 1).