10分onlyFactorize y^4-13y^2+36
回答 (2)
2006-12-19 5:47 am
Let y^2 be x
x^2-13x+36
=(x-4)(x-9)
subs. y^2=x into (x-4)(x-9)
(y^2 - 4)(y^2 - 9)
=(y^2 - 2^2)(y^2 - 3^2)
=(y+2)(y+3)(y-2)(y-3)
x^2-13x+36
=(x-4)(x-9)
subs. y^2=x into (x-4)(x-9)
(y^2 - 4)(y^2 - 9)
=(y^2 - 2^2)(y^2 - 3^2)
=(y+2)(y+3)(y-2)(y-3)
2006-12-19 5:36 am
y^4-13y^2+36
=(y^2-4)(y^2-9)
=(y+2)(y-2)(y+3)(y-3)
=(y^2-4)(y^2-9)
=(y+2)(y-2)(y+3)(y-3)
收錄日期: 2021-04-12 23:58:51
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https://hk.answers.yahoo.com/question/index?qid=20061218000051KK04170