X的4次方减去X的平方减20,怎么样因式分解

问题描述:

X的4次方减去X的平方减20,怎么样因式分解

X^4-X^2-20
=(X^2+5)(X^2-4)
=(X^2+5)(X-2)(X+2)

X^4-X²-20
=(X²+4)(X²-5)
=(X²+4)(X+√5)(X-√5)

x^4-x^2-20
=(x^2-5)(x^2+4)