Question

4a²+4a-4a²b+b+1-----------因式分解 a(a²-a-1）+1 ax

Answer 1

4a²+4a-4a²b+b+1=4a^2+4a+1-4a^2b+b+1=(2a+1)^2-b(4a^2-1)=(2a+1)^2-b(2a+1)(2a-1)

=(2a+1)(2a+1-2ab+b)