(m2-n2) (m2-n-2) - 8 = 0, then the value of m2-n2 is

(m2-n2) (m2-n-2) - 8 = 0, then the value of m2-n2 is

(m2-n2) (m2-n-2) - 8 = 0, then the value of m2-n2 is ± 2 √ 2
(m2-n2) (m2-n-2)-8=0
(m2-n2) (m2-n-2)=8
m2-n2=±2√2