(m+n)^2-4p^4=?

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(m+n)^2-4p^4=?

(m+n)^2-4p^4=?
(m+n)^2-4p^4=?

(m+n)^2-4p^4=?
(m+n)²-4p^4
=(m+n)²-(2p²)²
=(m+n+2p²)(m+n-2p²)