pls answer as fast as possible
(l+2n+m)² + (l-2n+m)², simplify
Answers
Answer:
lol
Step-by-step explanation:
the area or region near or about a place; surrounding district; neighborhood: There are no stores in the vicinity of our house. state or fact of being near; proximity; propinquity: He was troubled by the vicinity of the nuclear testing area.
Answer:
2l² + 2m² + 8n² + 4lm
Step-by-step explanation:
(l+2n+m)(l+2n+m) + (l-2n+m)(l-2n+m)
=(l² + 2ln + lm + 2ln + 4n² + 2mn + lm +2mn + m²) + (l² + -2ln + lm + -2ln + 2n² + -2mn + lm - 2mn + m²) rearrange
= (l² + m² + 4n² + 2ln + 2ln + 2mn + 2mn + lm + lm) + (l² + m² + 4n² + -2ln - 2ln + -2mn - 2mn + lm + lm)
= (l² + m² + 4n² +4ln + 4mn + 2lm) + (l² + m² + 4n² - 4ln - 4mn + 2lm)
= 2l² + 2m² + 8n² + 0ln + 0mn + 4lm
= 2l² + 2m² + 8n² + 4lm