Evaluate
\left(a-3\right)\left(a+4\right)
Expand
a^{2}+a-12
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4a+a^{2}-12-3a
Apply the distributive property by multiplying each term of a-3 by each term of 4+a.
a+a^{2}-12
Combine 4a and -3a to get a.
4a+a^{2}-12-3a
Apply the distributive property by multiplying each term of a-3 by each term of 4+a.
a+a^{2}-12
Combine 4a and -3a to get a.
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