wykonaj mnożenie i zreduguj wyrazy podobne:
1) 2(a+3)(3a-2),
2) (3a^-b)(a^-2b)
3) -4(a-2b)(2b-a)
a) (2a+6)(3a-2)= 6a²+18a-4a-12 = 6a²+14a-12
b) (3a²-b)(a²-2b)= 3a(do czwartej) - a²b +6a²b +2b² = 3a(do czwartej) +5a²b+2b²
c) -4(a-2b)(2b-a)= (-4a+8b)(2b-a)= -8ab+16b²+4a²-8ab= 4a²+16b²-16ab
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a) (2a+6)(3a-2)= 6a²+18a-4a-12 = 6a²+14a-12
b) (3a²-b)(a²-2b)= 3a(do czwartej) - a²b +6a²b +2b² = 3a(do czwartej) +5a²b+2b²
c) -4(a-2b)(2b-a)= (-4a+8b)(2b-a)= -8ab+16b²+4a²-8ab= 4a²+16b²-16ab