问题
填空题
在实数范围内分解因式:x4-4x2+3=______.
答案
x4-4x2+3=x4-4x2+3+1-1
=(x4-4x2+4)-1
=(x2-2)2-1
=(x2-2+1)(x2-2-1)
=(x2-1)(x2-3)
=(x+1)(x-1)(x+
)(x-3
).3
在实数范围内分解因式:x4-4x2+3=______.
x4-4x2+3=x4-4x2+3+1-1
=(x4-4x2+4)-1
=(x2-2)2-1
=(x2-2+1)(x2-2-1)
=(x2-1)(x2-3)
=(x+1)(x-1)(x+
)(x-3
).3