-12a^2 + 5a + a + 11a^2 - a^2 - 1Combine like terms:-12a^2 + 11a^2 - a^2 + 5a + a = -2a^2 + 6aNow add -1:-2a^2 + 6a - 1
So, (-12a^2 + 5a) + (a + 11a^2) - (a^2 - 1) simplifies to -2a^2 + 6a - 1.
-12a^2 + 5a + a + 11a^2 - a^2 - 1
Combine like terms:
-12a^2 + 11a^2 - a^2 + 5a + a = -2a^2 + 6a
Now add -1:
-2a^2 + 6a - 1
So, (-12a^2 + 5a) + (a + 11a^2) - (a^2 - 1) simplifies to -2a^2 + 6a - 1.