Упростите выражения:
1. 3b^2+(8-3b)(b+5)
2.a(a-3)+(2+1)(a+4)
3.(c+2)c-(c+3)(c-3)
1. 3b^2+(8-3b)(b+5)
2.a(a-3)+(2+1)(a+4)
3.(c+2)c-(c+3)(c-3)
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Answers & Comments
2)a(a-3)+(2+1)(a+4)=a^2-3a+2a+8+1a+4=a^2+12;
3)(c+2)c-(c+3)(c-3)=c^2+2c-c^2-9