Wykonaj podane działania a wynik doprowadz do najprosztszej postaci.
A) 2(a+3)(b)+3(b-2)(a-b)
B) (2a-3b+1)(8a+b)+9(a-5)
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A) 2(a+3)(b)+3(b-2)(a-b)=
=2(ab+3b)+3(ab-b²-2a+2b)=
=2ab+6b+3ab-3b²+6a+6b=
=5ab+12b+6a-3b²
B) (2a-3b+1)(8a+b)+9(a-5)=
=16a²+2ab+8a+2ab-3b²+b+9a-45=
=16a²-3b²+4ab+17a+b-45