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2010-02-08T18:14:40+01:00
(x+1)(x+2) = x²+2x+x+2 = x²+3x+2
(2a+3)(a+4) = 2a²+4a+3a+12 = 2a²+7a+12
(3x+5)(x-6) = 3x²-18x+5x-30 = 3x²-13x-30
(4-2k)(k+3) = 4k+12-2k²-6k = -2k+12- 2k²
(6t-2)(3t-4) = 18t²-24t-6t+8 = 18t²-30t+8
(-5x-2)(-3x-4) = 15x²+20x+6x+8 = 15x²+26x+8