Question

x3-x=5814解方程x的立方减x等于5814等于.最好是有步骤的,谢啦

Answer 1

x³-x-5814=0

x³-5832-x+18=0

(x-18)(x²+18x+324)-(x-18)=0

(x-18)(x²+18x+324-1)=0

(x-18)(x²+18x+323)=0

x²+18x+323=0无解

x=18