(3m-n)2 - (m - 2n)2
factorise...
Answers
Answered by
2
Answer:
(4m-3n)(2m+n)
Step-by-step explanation:
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Answered by
4
Answer:
(3m-n)² - (m-2n)²
= 9m² -6mn +n² - (m² - 4mn + 4n²)
[(a-b)² = a² - 2ab +b²]
=9m²-m²-6mn+4mn +n²- 4n²
(solving the brackets and rearranging)
=8m²-6mn-3n²
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