1.(3m+2n)^2-4(m-n)^2 2.3a(a+b)^2-27ab^2
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1.(3m+2n)^2-4(m-n)^22.3a(a+b)^2-27ab^21.(3m+2n)^2-4(m-n)^22.3a(a+b)^2-27ab^21.(3m+2n)^2-4(m-n)^22.3a
1.(3m+2n)^2-4(m-n)^2 2.3a(a+b)^2-27ab^2
1.(3m+2n)^2-4(m-n)^2 2.3a(a+b)^2-27ab^2
1.(3m+2n)^2-4(m-n)^2 2.3a(a+b)^2-27ab^2
1.(3m+2n)^2-4(m-n)^2=(3m+2n+2m-2n)(3m+2n-2m+2n)=5m(m+4n)
2.3a(a+b)^2-27ab^2=3a[(a+b)^2-9b^2]=3a(a+b+3b)(a+b-3b)=3a(a+4b)(a-2b)
1. (3m+2n)^2-4(m-n)^2
=[(3m+2n)+(2m-2n)][(3m+2n)-(2m-2n)]
=(3m+2n+2m-2n)(3m+2n-2m+2n)
=5m(m+4n)
2. 3a(a+b)^2-27ab^2=3a[(a+b)^2-9b^2]=3a(a+b+3b)(a+b-3b)=3a(a+4b)(a-2b)
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