Simplify: (2a2−3b)−(a2+5b−1)(2a^2 - 3b) - (a^2 + 5b - 1)(2a2−3b)−(a2+5b−1).
a2−8b+1a^2 - 8b + 1a2−8b+1
a2+2b−1a^2 + 2b - 1a2+2b−1
3a2+2b+13a^2 + 2b + 13a2+2b+1
a2−8b−1a^2 - 8b - 1a2−8b−1