(m+n)^2-3(2m+2n-3)

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(m+n)^2-3(2m+2n-3)
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(m+n)^2-3(2m+2n-3)
(m+n)^2-3(2m+2n-3)

(m+n)^2-3(2m+2n-3)
(m+n)^2-3(2m+2n-3)
=(m+n)^2-6(m+n)+9
=(m+n-3)^2

(m+n)^2-3(2m+2n-3)
=(m+n)^2-3(2m+2n)+9
=(m+n-3)^2