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a+b-3\left(a-b\right)\left(1-a\right)
Multiply -1 and 3 to get -3.
a+b+\left(-3a+3b\right)\left(1-a\right)
Use the distributive property to multiply -3 by a-b.
a+b-3a+3a^{2}+3b-3ba
Apply the distributive property by multiplying each term of -3a+3b by each term of 1-a.
-2a+b+3a^{2}+3b-3ba
Combine a and -3a to get -2a.
-2a+4b+3a^{2}-3ba
Combine b and 3b to get 4b.
a+b-3\left(a-b\right)\left(1-a\right)
Multiply -1 and 3 to get -3.
a+b+\left(-3a+3b\right)\left(1-a\right)
Use the distributive property to multiply -3 by a-b.
a+b-3a+3a^{2}+3b-3ba
Apply the distributive property by multiplying each term of -3a+3b by each term of 1-a.
-2a+b+3a^{2}+3b-3ba
Combine a and -3a to get -2a.
-2a+4b+3a^{2}-3ba
Combine b and 3b to get 4b.