1) -7а(а³+6а²-а+2)
2) (5+х)(х-3)
3)(6-5а)(9b+3)
4)8a(a+1)-(a+1)
5)2a(1-b)-3(b-1)
6) 9x-17=2x+4
2) (5+х)(х-3)
3)(6-5а)(9b+3)
4)8a(a+1)-(a+1)
5)2a(1-b)-3(b-1)
6) 9x-17=2x+4
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Answers & Comments
1) -7а(а³+6а²-а+2)=-7а⁴-42а³+7а²-14а
2) (5+х)(х-3)=5х-15+х²-3х=х²+2х-15
3)(6-5а)(9b+3)=54b+18-45ab-15а
4)8a(a+1)-(a+1)=8а²+8-а-1=8а²-а+7
5)2a(1-b)-3(b-1)=2а-2аb-3b+3
6) 9x-17=2x+4 9х-2х=4+17 7х=21 х=3