упростите 3a(a+2) - (a-3) б) 8с+4(1-c)² d) (c+2) (c-3) - (c-1)²

3a(a+2) - (a-3)=3a²+6a-a+3=3a²+5a+3б) 8с+4(1-c)²=8c+4(c²-2c+1)=8c+4c²-8c+4=4c²+4d) (c+2) (c-3) - (c-1)²=c²+2c-3c-6-(c²-2c+1)=c²-c-6-c²+2c-1=c-7