(m2-n2)(m2-n-2)-8=0,則m2-n2的值是

(m2-n2)(m2-n-2)-8=0,則m2-n2的值是

(m2-n2)(m2-n-2)-8=0,則m2-n2的值是±2√2
(m2-n2)(m2-n-2)-8=0
(m2-n2)(m2-n-2)=8
m2-n2=±2√2