X⁴- X² - 6 = 0 X² - 3Xy - 28y² = 0

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/30 02:39:05
X⁴- X² - 6 = 0 X² - 3Xy - 28y² = 0

X⁴- X² - 6 = 0 X² - 3Xy - 28y² = 0
X⁴- X² - 6 = 0 X² - 3Xy - 28y² = 0

X⁴- X² - 6 = 0 X² - 3Xy - 28y² = 0
X⁴- X² - 6 = 0
( X² +2)(X² - 3) = 0
X² =3
x=±根号3
X² - 3Xy - 28y² = 0
(x+4y)(x-7y)=0
x=-4y 或x=7y

x^4-x²-6=0
(x²-3)(x²+2)=0
∵x²+2>0
∴x²-3=0
x=±根号3
x²-3xy-28y²=0
(x-7y)(x+4y)=0
x1=7y,x2=-4y