(1) b²(a-4)+4-a ;
=b^2(a-4)-(a-4)
=(a-4)(b^2-1)
=(a-4)(b+1)(b-1)
(2) x的(n+3)次方-x的(n-1)次方;
=x^(n-1)(x^4-1)
=x^(n-1)(x^2+1)(x+1)(x-1)
(1) b²(a-4)+4-a ;
=b^2(a-4)-(a-4)
=(a-4)(b^2-1)
=(a-4)(b+1)(b-1)
(2) x的(n+3)次方-x的(n-1)次方;
=x^(n-1)(x^4-1)
=x^(n-1)(x^2+1)(x+1)(x-1)