Question

Помогите букву а и б

Answer 1

a²-3a+1=7   a²-3a-6=0  

a²=6+3a  

a)  2a²-6a+2=12+6a-6a+2=14

б) a²(a²-3a+1)-3a(a²-3a+1)=a(a²-3a+1)(a-3)=a(6+3a-3a+1)(a-3)=7(a²-3a)=
7(6+3a-3a)=42