Объяснение:
3a( a + 2 ) - ( a + 3 )^2 = 3a^2 + 6a - ( a^2 + 6a + 9 ) = 3a^2 + 6a - a^2 - 6a - 9 = 2a^2 - 9
a = - 5
2 • 25 - 9 = 41
Объяснение:
3a( a + 2 ) - ( a + 3 )^2 = 3a^2 + 6a - ( a^2 + 6a + 9 ) = 3a^2 + 6a - a^2 - 6a - 9 = 2a^2 - 9
a = - 5
2 • 25 - 9 = 41