Question

(3a^2-a+2)+(-3a^2+3a-1)-(a^2-1)=

Answer 1

(3a^2-a+2)+(-3a^2+3a-1)-(a^2-1)=3a^2-a+2-3a^2+3a-1-a^2+1=3a^2-3a^2-a^2-a+3а+2-1+1=-a^2+2а+2