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b) (2x-3)(3x-4) = 6x^2 -8x - 9x + 12 = 6x^2 - 17x + 12
c) (4k+1)(4k+1) = 16k^2 + 8k + 1
d) (a+2)(a^2-2a+1) = a^3 - 3a + 2