解:原式=m²+2m-4 =(m²+2m+1)-5 =(m+1)²-5 =(m+1)²-√5² =(m+1+√5)(m+1-√5)
m²+2m-4=m²+2m+1-5=(m+1)² - 5 =(m+1+根号5)(m+1-根号5)
题没错?