①a^2-a-2
②a^2+2-2
③a^2-2a-8
④a^2+7a-8
①a^2-a-2
②a^2+2-2
③a^2-2a-8
④a^2+7a-8
1、a²-a-2=(a-2)(a+1)
2、a²+a-2=(a+2)(a-1)
3、a²-2a-8=(a-4)(a+2)
4、a²+7a-8=(a+8)(a-1)
①a^2-a-2=(a-2)(a+1)
②a^2+2-2=a^2
③a^2-2a-8=(a-4)(a+2)
④a^2+7a-8=(a+8)(a-1)
①a^2-a-2=(a+1)(a-2)
②a^2+2-2=a^2
③a^2-2a-8=(a-4)(a+2)
④a^2+7a-8=(a+8)(a-1)
①a^2-a-2=(a-2)(a+1)
②a^2+2-2=
③a^2-2a-8=(a-4)(a+2)
④a^2+7a-8=(a-8)(a-1)