60балов Помогите срочно!!!!!!!!!!!!!!!!!!!!!!!!!!!

Question

60балов
Помогите срочно!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Answer 1

1) a^2 + 2a -3a -6 - a^3-3a^2+3a1^2-1^3=a^3+2a-9
     3a=3
      a= 1 
2)  b^2-2b-b^2-1= -2b-1
b=-1/-2=1/2=0.5