(3m-n²) -(m-2n)²
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Step-by-step explanation:
(3m-n)2 - (m-2n)2
= (3m)2 - 6mn +n2 - ( m2 - 4mn +4n2)
=9m2 - 6mn +n2 - m2 +4mn-4n2
=8m2-2mn-2n2
= 4m2-mn-n2 ....... dividing both side by 2
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