Question

解方程x的5次方-x的3次方-2x=0

Answer 1

x的5次方-x的3次方-2x=0

x(x^4-x^2-2)=0

x(x^2+1)(x^2-2)=0

x(x^2+1)(x+根号2)(x-根号2)=0

x=0 或 x=-根号2 或 x=根号2