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\left(a-1\right)\left(2a+1\right)
Combine a and a to get 2a.
2a^{2}+a-2a-1
Apply the distributive property by multiplying each term of a-1 by each term of 2a+1.
2a^{2}-a-1
Combine a and -2a to get -a.
\left(a-1\right)\left(2a+1\right)
Combine a and a to get 2a.
2a^{2}+a-2a-1
Apply the distributive property by multiplying each term of a-1 by each term of 2a+1.
2a^{2}-a-1
Combine a and -2a to get -a.