Question

3(m+n)²-10(m+n)(m+n)+3(m-n) ²​

Answer 1

Answer:

= 6m²+2n²-7m-9n

Step-by-step explanation:

= 3(m+n)²-10(m+n)(m+n)+3(m-n) ²​

= 3m²+3n² -10m+-10n+m+n+3m²-n²

Arrange it to like terms

= ( 3m²+3m²)+(3n²-n²)-10m+3m+n-10n

= 6m²+2n²-7m-9n

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