问题
解答题
对下列代数式分解因式
(1)4x3-16xy2
(2)a3+6a2+9a
(3)(x-1)(x-3)+1.
答案
(1)4x3-16xy2,
=4x(x2-4y2),
=4x(x+2y)(x-2y);
(2)a3+6a2+9a,
=a(a2+6a+9),
=a(a+3)2;
(3)(x-1)(x-3)+1,
=x2-4x+3+1,
=x2-4x+4,
=(x-2)2.
对下列代数式分解因式
(1)4x3-16xy2
(2)a3+6a2+9a
(3)(x-1)(x-3)+1.
(1)4x3-16xy2,
=4x(x2-4y2),
=4x(x+2y)(x-2y);
(2)a3+6a2+9a,
=a(a2+6a+9),
=a(a+3)2;
(3)(x-1)(x-3)+1,
=x2-4x+3+1,
=x2-4x+4,
=(x-2)2.