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(6x^2-42x+48) - (-3x^2-6x+48) = 6x^2 - 42x + 48 + 3x^2 + 6x - 48 = 6x^2+3x^2 - 42x + 6x +48 - 48 = 9x^2 - 36x = 9x(x-4)
= (6 - 42x + 48) - (-3 - 6x + 48)
= 6 - 42x + 48 + 3 + 6x - 48
= 9 - 36x