49[m+n]^2-[3m-n]^2
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49[m+n]^2-[3m-n]^2
![49[m+n]^2-[3m-n]^2](/uploads/image/z/20144412-36-2.jpg?t=49%5Bm%2Bn%5D%5E2-%5B3m-n%5D%5E2)
49(m+n)^2-(3m-n)^2
=[7(m+n)]^2-(3m-n)^2
=[7(m+n)+(3m-n)][7(m+n)-(3m-n)]
=(7m+7n+3m-n)(7m+7n-3m+n)
=(10m+6n)(4m+8n)
=8(5m+3n)(m+2n)
=[7(m+n)]^2-(3m-n)^2
=[7(m+n)+(3m-n)][7(m+n)-(3m-n)]
=(7m+7n+3m-n)(7m+7n-3m+n)
=(10m+6n)(4m+8n)
=8(5m+3n)(m+2n)
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