упрастите выражение: (m+4)^2-4(m+1)^2

3(2-y)^2+4(y-5)^2

1)(m+4)² - 4(m+1)² = m² + 8m + 16 - 4 (m² + 2m + 1) = m² + 8m + 16 - 4m² - 8m - 4 = - 3m² + 12

2) 3(2-y)² + 4(y-5)² = 3 (4-4y+y²) + 4 (y² - 10y + 25) = 12 - 12y + 3y² + 4y² - 40y + 100 = 112 - 52y + 7y² = 7y² - 52y + 112