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