Math, asked by Anonymous, 6 months ago

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

Answers

Answered by bson

2

Step-by-step explanation:

9(m²+2mn+n²)-4(9m²-3mn+n²)

9m²+18mn+9n²-36m²+12mn-4n²

m²(9-36)+ mn(18+12) +n²(9-4)

-27m²+30mn+5n²

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