Question

用配方法解方程　　x平方减8x加1等于0　怎么做　

Answer 1

x^2-8x+1=0 x^2-8x+16-16+1=0 (x-4)^2=15 |x-4|=根号15 x-4=±根号15 x=4±根号15

Answer 2

x^2-8x+1=0，等式两边加15x^2-8x+16=15(x-4)^2=15所以x-4等于±√15x=4±√15

Answer 3

(X-4)^2-16+1=0, (x-4)^2=16, x=8或0

Answer 4

X^2-8X+1=0X^2-8X+16-16+1=0(X-4)^2=15X-4=±√15X1=4+√15 X2=4-√15

Answer 5

X�0�5-8X+16-15=0（X-4)�0�5=15