9(m+n)^-(m-n)^

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9(m+n)^-(m-n)^

9(m+n)^-(m-n)^
9(m+n)^-(m-n)^

9(m+n)^-(m-n)^
9(m+n)^2-(m-n)^2
=(3m+3n)^2-(m-n)^2
=(3m+3n-m+n)(3m+3n+m-n)
=4(m+2n)(2m+n)

9(m+n)^2-(m-n)^2
=(3m+3n+m-n)(3m+3n-m+n)
=(4m+2n)(2m+4n)

9(m+n)²-(m-n)²
=(3m+3n)²-(m-n)²
=(3m+3n-m+n)(3m+3n+m-n)
=(2m+4n)(4m+2n)
=4(m+2n)(2m+n)

={3(m+n)+(m-n)}{3(m+n)-(m-n)}
=(4m+2n)(2m+4n)

9(m+n)²-(m-n)²
=(3m+3n)²-(m-n)²
=(3m+3n-m+n)(3m+3n+m-n)
=(2m+4n)(4m+2n)
=4(m+2n)(2m+n)
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