Question

(x2 +x)(x2+ x-14)+ 24=0 (X后面的2是平方)

Answer 1

用换元法,设x2+x=a,则原式等于a2-14a+24=0十字相乘的（a-2)（a-12）=0,a=2或12,x2+x=2或12,x=-2或1或3或-4

ok!