Odpowiedź:
a) (x + 5)(x – 7) = x²-7x+5x-35 = x²-2x-35
b) (a – b)(a + 4)(11 – b) = (a²+4a-ab-4b)(11-b) = 11a²+11a-11ab-44b-a²b-4ab+ab²+4b² = 11a²-a²b+15ab+ab²-44b
c) (x² – 3)(4 – x) = 4x²-x³-12+3x = -x³+4x²+3x-12
d) (5x – 7)(2x + 3)-(4x – 2)8 = (10x²+15x-14x-21)-(32x-16) = 10x²+x-21-32x+16 = 10x²-31x-5
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Odpowiedź:
a) (x + 5)(x – 7) = x²-7x+5x-35 = x²-2x-35
b) (a – b)(a + 4)(11 – b) = (a²+4a-ab-4b)(11-b) = 11a²+11a-11ab-44b-a²b-4ab+ab²+4b² = 11a²-a²b+15ab+ab²-44b
c) (x² – 3)(4 – x) = 4x²-x³-12+3x = -x³+4x²+3x-12
d) (5x – 7)(2x + 3)-(4x – 2)8 = (10x²+15x-14x-21)-(32x-16) = 10x²+x-21-32x+16 = 10x²-31x-5