factorise the following
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(3m+2n)2
(3m+2n)(3m+2n)
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9m²+4n²+12mn=0
9m²+2(2n²+6mn)=0
9m²+6mn+2n²=0
3(3m²+2mn)+2n²=0
3m²+2mn+2n²
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