(b) -m² + 6mn from 4m2 - 2mn + 7
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=5m²-8mn+7
Step-by-step explanation:
-m²+6mn from 4m²-2mn+7
=4m²-2mn+7 -(-m²+6mn)
=4m²-2mn+7+m²-6mn
=4m²+m²-2mn-6mn+7
=5m²-8mn+7
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